TCPConnector: Don't leak socket descriptors.
TCPConnector: Don't leak socket descriptors.

Also check to see if socket() returns error (less than 0) and error out.

333fred/ntcore,robotdotnet/ntcore,wpilibsuite/ntcore,robotdotnet/ntcore,robotdotnet/ntcore,333fred/ntcore,wpilibsuite/ntcore,wpilibsuite/ntcore,wpilibsuite/ntcore,333fred/ntcore,robotdotnet/ntcore,333fred/ntcore