In vn_open(), unset ndp->ni_vp when returning failure so that code which expects it to be NULL unless the return value was 0 will work.
In vn_open(), unset ndp->ni_vp when returning failure so that code
which expects it to be NULL unless the return value was 0 will work.

Obtained from:	TrustedBSD Project
Sponsored by:	DARPA, Network Associates Laboratories

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