improve socket create/bind latency in some cases

author	Daniel Borkmann	2014-01-15 15:25:34 (GMT)
committer	David S. Miller	2014-01-17 00:17:11 (GMT)
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was != 0, plus follow-up register_prot_hook() with a bound device

In the case when the protocol and user supplied device index (== 0)

the same work twice. Similarly for re-binding to the same device