kevans 7bc0206cc8 if_vmove: return proper error status
if_vmove can fail if it lost a race and the vnet's already been moved. The
callers (and their callers) can generally cope with this, but right now
success is assumed. Plumb out the ENOENT from if_detach_internal if it
happens so that the error's properly reported to userland.

Reviewed by:	bz, kp
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D22780
2020-01-09 03:52:50 +00:00
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