node: only run same AL once on error

Should have been included with 60fcc11 as it is the same type of fix.

Signed-off-by: Forrest L Norvell <ogd@aoaioxxysz.net>
node: remove asyncStack

Now that the context stores the active execution stack, and because
removeAsyncListener() always removed the AsyncListener from the queue
and the stack, there's no need to keep a stack around anymore. Instead
the active asyncQueue and the currentContext is able to handle it all.

Signed-off-by: Forrest L Norvell <ogd@aoaioxxysz.net>