core: fix crash on plugin reload when using musl libs (closes #2052)

src/plugins/trigger/trigger-buffer.c

@@ -388,6 +388,12 @@ trigger_buffer_display_trigger (struct t_trigger *trigger,
 void
 trigger_buffer_end ()
 {
+    if (trigger_buffer)
+    {
+        weechat_buffer_close (trigger_buffer);
+        trigger_buffer = NULL;
+    }
+
     if (trigger_buffer_filters)
     {
         weechat_string_free_split (trigger_buffer_filters);

src/plugins/trigger/trigger-callback.c

@@ -1534,5 +1534,8 @@ void
 trigger_callback_end ()
 {
     if (trigger_callback_hashtable_options_conditions)
+    {
         weechat_hashtable_free (trigger_callback_hashtable_options_conditions);
+        trigger_callback_hashtable_options_conditions = NULL;
+    }
 }

src/plugins/trigger/trigger-callback.h

@@ -105,6 +105,8 @@ struct t_trigger_context
     }                                                           \
     return __rc;
 
+extern unsigned long trigger_context_id;
+
 extern int trigger_callback_signal_cb (const void *pointer, void *data,
                                        const char *signal,
                                        const char *type_data,

src/plugins/trigger/trigger-config.c

@@ -831,4 +831,5 @@ void
 trigger_config_free ()
 {
     weechat_config_free (trigger_config_file);
+    trigger_config_file = NULL;
 }

src/plugins/trigger/trigger.c

@@ -1391,6 +1391,8 @@ weechat_plugin_init (struct t_weechat_plugin *plugin, int argc, char *argv[])
 
     weechat_plugin = plugin;
 
+    trigger_enabled = 1;
+
     trigger_callback_init ();
 
     trigger_command_init ();
@@ -1427,6 +1429,7 @@ weechat_plugin_end (struct t_weechat_plugin *plugin)
     trigger_free_all ();
     trigger_config_free ();
     trigger_callback_end ();
+    trigger_context_id = 0;
 
     return WEECHAT_RC_OK;
 }