(try 2) ws2_32: getsockname should fail for unbound sockets

[Damjan Jovanovic]

Try 2 checks whether sin[6]_addr is zero in addition to checking
whether sin[6]_port is zero when deciding if a sockaddr is bound.

Changelog:
* getsockname should fail with WSAEINVAL if the socket isn't bound,
and leave the sockaddr unmodified.

Damjan Jovanovic
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