QtIFW

RemoteServer: Exit early if authorization failed

There's no point in listening to the socket after the
authorization failed. It will then be closed by the client,
anyway.

Change-Id: I26eb2023e08ac3b16ecb894a89ffa0bfeddc62b0
Reviewed-by: Niels Weber <niels.weber@theqtcompany.com>
Reviewed-by: Karsten Heimrich <karsten.heimrich@theqtcompany.com>