r20330: And here's the fix for the parent winbindd crashing

after it's child died unexpectedly whilst the parent
was waiting for a reply. We need to clean up the request
we're not going to service, plus we still need to call
the continuation function with a "False" flag so it
can clean things up. Still testing this, but I think
I'm right.
Jeremy

source/nsswitch/winbindd_dual.c

@@ -192,7 +192,12 @@ static void async_reply_recv(void *private_data, BOOL success)
 
 	if (!success) {
 		DEBUG(5, ("Could not receive async reply\n"));
+
+		cache_cleanup_response(child->pid);
+		DLIST_REMOVE(child->requests, state);
+
 		state->response->result = WINBINDD_ERROR;
+		state->continuation(state->private_data, False);
 		return;
 	}