virnetsocket: Resolve Coverity RESOURCE_LEAK
Since '1b807f92' - Coverity complains that in the error paths of both virFork() and virProcessWait() that the 'passfd' will not be closed. Added the VIR_FORCE_CLOSE(passfd) and initialized it to -1. Also noted that variable 'buf' was never really used - so I removed it
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