plugins: remove check of NULL pointers before calling weechat_arraylist_free() (issue #865)

src/plugins/logger/logger-backlog.c

@@ -243,8 +243,7 @@ logger_backlog_group_messages (struct t_arraylist *lines)
 
 error:
     free (message);
-    if (messages)
-        weechat_arraylist_free (messages);
+    weechat_arraylist_free (messages);
     return NULL;
 }
 

src/plugins/logger/logger-tail.c

@@ -233,8 +233,7 @@ logger_tail_file (const char *filename, int lines)
 
 error:
     free (part_of_line);
-    if (list_lines)
-        weechat_arraylist_free (list_lines);
+    weechat_arraylist_free (list_lines);
     if (fd >= 0)
         close (fd);
     return NULL;