hselasky c5d6dce698 Don't register IOCTLs with capsicum when there is no valid file descriptor.
This fixes tcpdump when using mlx5_X devices.

Differential Revision:	https://reviews.freebsd.org/D18499
Reviewed by:		kib@, slavash@, oshogbo@
MFC after:		1 week
Sponsored by:		Mellanox Technologies
2018-12-12 09:51:10 +00:00
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