script: fix memory leak in read of script repository file if it has invalid content

ChangeLog.adoc

@@ -39,6 +39,7 @@ Bug fixes::
   * irc: fix memory leak when the channel topic is changed
   * logger: fix crash when logging is disabled on a buffer and the log file was deleted in the meanwhile, when option logger.file.info_lines is on (issue #1444)
   * relay: update buffers synchronization when buffers are renamed (issue #1428)
+  * script: fix memory leak in read of script repository file if it has invalid content
   * script: fix unexpected display of scripts list in buffer with command /script list -i
   * xfer: send signal "xfer_ended" after the received file has been renamed (issue #1438)
 

src/plugins/script/script-repo.c

@@ -1241,6 +1241,8 @@ script_repo_file_read (int quiet)
         {
             if (strstr (ptr_line, "<plugin id="))
             {
+                if (script)
+                    script_repo_free (script);
                 script = script_repo_alloc ();
                 weechat_hashtable_remove_all (descriptions);
             }