Unlink UNIX domain socket file only if: 1. The descriptor is the one we are listening on (not the one when we connect    as a client and not the one which is created on accept(2)). 2. Descriptor was created by us (PID matches with the PID stored on bind(2)).
Unlink UNIX domain socket file only if:
1. The descriptor is the one we are listening on (not the one when we connect
   as a client and not the one which is created on accept(2)).
2. Descriptor was created by us (PID matches with the PID stored on bind(2)).

Reported by:	Mikolaj Golub <to.my.trociny@gmail.com>
MFC after:	1 week

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