scripts: fix return value of hook_infolist callback (pointer instead of string)

src/plugins/lua/weechat-lua-api.c

@@ -3124,7 +3124,7 @@ weechat_lua_api_hook_infolist_cb (const void *pointer, void *data,
 
         result = (struct t_infolist *)weechat_lua_exec (
             script,
-            WEECHAT_SCRIPT_EXEC_STRING,
+            WEECHAT_SCRIPT_EXEC_POINTER,
             ptr_function,
             "ssss", func_argv);