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

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);
             }