Fix PAIR v0 not finalizing the pollables when closing socket #1640
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This function needs to be pretty much identical between PAIR v0 and v1, it was missing just the call to release the pollable resources.
I was testing the compat API and i discovered that when using PAIR v0, it was leaking file descriptors because of this. This solves the problem completely mirroring the same logic present in PAIR v1 (https://github.com/nanomsg/nng/blob/master/src/sp/protocol/pair1/pair.c#L79-L80).