app_stack: Include current location if branch fails

Previously, the error emitted when app_stack tries
to branch to a dialplan location that doesn't exist
has included only the information about the attempted
branch in the error log. This adds the current location
as well so users can see where the branch failed in
the logs.

ASTERISK-29626

Change-Id: Ia23502ab2ad21485a1ac74295063a8f25a6df5ce

apps/app_stack.c

@@ -590,8 +590,8 @@ static int gosub_exec(struct ast_channel *chan, const char *data)
 	ast_channel_unlock(chan);
 
 	if (!ast_exists_extension(chan, dest_context, dest_exten, dest_priority, caller_id)) {
-		ast_log(LOG_ERROR, "Attempt to reach a non-existent destination for %s: (Context:%s, Extension:%s, Priority:%d)\n",
-			app_gosub, dest_context, dest_exten, dest_priority);
+		ast_log(LOG_ERROR, "%s attempted to reach non-existent destination '%s,%s,%d' from '%s,%s,%d'",
+			app_gosub, dest_context, dest_exten, dest_priority, orig_context, orig_exten, orig_priority);
 		goto error_exit;
 	}