Exit codes should reflect reality

It seems, onionprobe exits with 0 aka success in any case, while it should probably exit with > 0 if things go wrong:

~ onionprobe -e test.onion; echo $?                                                                              
2022-07-23 12:52:30,170 INFO: Starting Onionprobe version 1.0.0...
2022-07-23 12:52:30,170 INFO: Initializing Tor process...
2022-07-23 12:52:32,145 INFO: Onionprobe is initialized. Hit Ctrl-C to interrupt it.
2022-07-23 12:52:32,145 INFO: Processing test.onion...
2022-07-23 12:52:32,145 ERROR: Invalid onion service address set for test.onion: test.onion
2022-07-23 12:52:32,146 INFO: Error while receiving a control message (SocketClosed): received exception "read of closed file"
2022-07-23 12:52:32,146 INFO: Error while receiving a control message (SocketClosed): received exception "peek of closed file"
2022-07-23 12:52:32,146 INFO: Error while receiving a control message (SocketClosed): received exception "peek of closed file"
2022-07-23 12:52:32,146 INFO: Error while receiving a control message (SocketClosed): received exception "peek of closed file"
2022-07-23 12:52:32,146 INFO: Error while receiving a control message (SocketClosed): received exception "peek of closed file"
2022-07-23 12:52:32,146 INFO: Error while receiving a control message (SocketClosed): received exception "peek of closed file"
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