Defer channel deletion until after i/o. There are some edge cases with events kicking users mid-event that can delete them.

src/uplink.cpp

@@ -136,6 +136,7 @@ bool UplinkSocket::ProcessRead()
 	{
 		Anope::Process(buf);
 		User::QuitUsers();
+		Channel::DeleteChannels();
 	}
 	return b;
 }