K 10
svn:author
V 6
royger
K 8
svn:date
V 27
2018-07-30T11:15:20.180688Z
K 7
svn:log
V 281
xen-blkfront: fix length check

Length is an unsigned integer, so checking against < 0 doesn't make
sense. While there also make clear that a length of 0 always succeeds.

Submitted by:		Pratyush Yadav <pratyush@freebsd.org>
Differential Review:	https://reviews.freebsd.org/D16045

END