K 10
svn:author
V 5
shurd
K 8
svn:date
V 27
2018-02-20T18:33:45.834443Z
K 7
svn:log
V 315
IFLIB: do not remove dmamap on buffer unload

Dmamap is created only on IFC attach. If we remove it on
buffer release, we won't be able to do ifconfig down&up. Only destroy
when in detach.

Reported by:	wma
Reviewed by:	wma
Sponsored by:	Limelight Networks
Differential Revision:	https://reviews.freebsd.org/D14060

END