[usocket-devel] Wait-for-input/socket-accept for sbcl/win32

[Kalyanov Dmitry]

Definition of USOCKET class has the comment the %READY-P slot is reset
by SOCKET-ACCEPT function. But right now SOCKET-ACCEPT does not reset
it, hence WAIT-FOR-INPUT will not actuall wait after the first it time
it notices the readiness.

Also, SB-BSD-SOCKETS:SOCKET-ACCEPT may return NIL (if accept call
returned EWOULDBLOCK, for example), and USOCKET:SOCKET-ACCEPT will try
to use it.

Attached is a patch that fixes these two issues.


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