core, plugins: set error to NULL before calling strtol()

This is not strictly necessary, just in case the function strtol() doesn't
update the pointer.

src/plugins/buflist/buflist-mouse.c

@@ -62,6 +62,7 @@ buflist_focus_cb (const void *pointer, void *data, struct t_hashtable *info)
     ptr_bar_item_line = weechat_hashtable_get (info, "_bar_item_line");
     if (!ptr_bar_item_line)
         goto end;
+    error = NULL;
     item_line = strtol (ptr_bar_item_line, &error, 10);
     if (!error || error[0])
         goto end;
@@ -250,9 +251,11 @@ buflist_hsignal_cb (const void *pointer, void *data, const char *signal,
         return WEECHAT_RC_OK;
     ptr_buffer = (struct t_gui_buffer *)value;
 
+    error = NULL;
     number = strtol (ptr_number, &error, 10);
     if (!error || error[0])
         return WEECHAT_RC_OK;
+    error = NULL;
     number2 = strtol (ptr_number2, &error, 10);
     if (!error || error[0])
         return WEECHAT_RC_OK;

src/plugins/irc/irc-list.c

@@ -281,6 +281,7 @@ irc_list_channel_match_filter (struct t_irc_server *server,
     else if (strncmp (server->list->filter, "u:>", 3) == 0)
     {
         /* filter by users (> N)*/
+        error = NULL;
         number = strtol (server->list->filter + 3, &error, 10);
         if (error && !error[0] && channel->users > (int)number)
             return 1;
@@ -288,6 +289,7 @@ irc_list_channel_match_filter (struct t_irc_server *server,
     else if (strncmp (server->list->filter, "u:<", 3) == 0)
     {
         /* filter by users (< N)*/
+        error = NULL;
         number = strtol (server->list->filter + 3, &error, 10);
         if (error && !error[0] && channel->users < (int)number)
             return 1;
@@ -295,6 +297,7 @@ irc_list_channel_match_filter (struct t_irc_server *server,
     else if (strncmp (server->list->filter, "u:", 2) == 0)
     {
         /* filter by users */
+        error = NULL;
         number = strtol (server->list->filter + 2, &error, 10);
         if (error && !error[0] && channel->users >= (int)number)
             return 1;
@@ -437,6 +440,7 @@ irc_list_parse_messages (struct t_irc_server *server, const char *output)
                     ptr_name++;
                 }
                 channel->name2 = strdup (ptr_name);
+                error = NULL;
                 number = strtol (params[2], &error, 10);
                 channel->users = (error && !error[0]) ? number : 0;
                 channel->topic = (num_params > 3) ?

src/plugins/irc/irc-message.c

@@ -625,6 +625,7 @@ irc_message_parse_cap_multiline_value (struct t_irc_server *server,
     ptr_value = (const char *)weechat_hashtable_get (values, "max-bytes");
     if (ptr_value)
     {
+        error = NULL;
         number = strtol (ptr_value, &error, 10);
         if (error && !error[0])
             server->multiline_max_bytes = number;
@@ -633,6 +634,7 @@ irc_message_parse_cap_multiline_value (struct t_irc_server *server,
     ptr_value = (const char *)weechat_hashtable_get (values, "max-lines");
     if (ptr_value)
     {
+        error = NULL;
         number = strtol (ptr_value, &error, 10);
         if (error && !error[0])
             server->multiline_max_lines = number;

src/plugins/irc/irc-protocol.c

@@ -421,6 +421,7 @@ irc_protocol_parse_time (const char *time)
             pos = strchr (time2, ',');
             if (pos)
                 pos[0] = '\0';
+            error = NULL;
             value = strtol (time2, &error, 10);
             if (error && !error[0] && (value >= 0))
                 time_value = (int)value;

src/plugins/irc/irc-redirect.c

@@ -462,6 +462,7 @@ irc_redirect_new_with_commands (struct t_irc_server *server,
                     if (pos)
                     {
                         pos[0] = '\0';
+                        error = NULL;
                         value = strtol (pos + 1, &error, 10);
                         if (!error || error[0])
                             value = -1;
@@ -1309,6 +1310,7 @@ irc_redirect_pattern_hsignal_cb (const void *pointer, void *data,
     timeout = 0;
     if (str_timeout && str_timeout[0])
     {
+        error = NULL;
         number = (int)strtol (str_timeout, &error, 10);
         if (error && !error[0])
             timeout = number;
@@ -1379,6 +1381,7 @@ irc_redirect_command_hsignal_cb (const void *pointer, void *data,
     count = 1;
     if (str_count && str_count[0])
     {
+        error = NULL;
         number = (int)strtol (str_count, &error, 10);
         if (error && !error[0])
             count = number;
@@ -1387,6 +1390,7 @@ irc_redirect_command_hsignal_cb (const void *pointer, void *data,
     timeout = 0;
     if (str_timeout && str_timeout[0])
     {
+        error = NULL;
         number = (int)strtol (str_timeout, &error, 10);
         if (error && !error[0])
             timeout = number;

src/plugins/plugin-api-info.c

@@ -877,6 +877,7 @@ plugin_api_info_nick_color_ignore_case_cb (const void *pointer, void *data,
     case_range = -1;
     if (num_items >= 2)
     {
+        error = NULL;
         number = strtol (items[1], &error, 10);
         if (error && !error[0])
             case_range = (int)number;
@@ -916,6 +917,7 @@ plugin_api_info_nick_color_name_ignore_case_cb (const void *pointer, void *data,
     case_range = -1;
     if (num_items >= 2)
     {
+        error = NULL;
         number = strtol (items[1], &error, 10);
         if (error && !error[0])
             case_range = (int)number;

src/plugins/relay/relay-auth.c

@@ -247,6 +247,7 @@ relay_auth_parse_pbkdf2 (const char *parameters,
     }
 
     /* parameter 2: iterations */
+    error = NULL;
     *iterations = (int)strtol (argv[1], &error, 10);
     if (!error || error[0])
         *iterations = 0;

src/plugins/xfer/xfer-network.c

@@ -63,6 +63,7 @@ xfer_network_convert_integer_to_ipv4 (const char *str_address)
     if (!str_address || !str_address[0])
         return NULL;
 
+    error = NULL;
     number = strtoll (str_address, &error, 10);
     if (!error || error[0] || (number <= 0) || (number > UINT32_MAX))
         return NULL;