allanjude 6093eb3b9f Make ifconfig always exit with an error code if an important ioctl fails
PR:		203062
Arm Twisting by:	Kristof Provost
Reviewed by:	kp
Approved by:	bapt (mentor)
MFC after:	2 weeks
Relnotes:	yes
Sponsored by:	ScaleEngine Inc.
Sponsored by:	vBSDCon
Differential Revision:	https://reviews.freebsd.org/D3644
2015-09-16 03:03:19 +00:00
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