K 10
svn:author
V 3
dim
K 8
svn:date
V 27
2022-07-29T18:50:10.875383Z
K 7
svn:log
V 708
Fix unused variable warning in xen's blkback.c

With clang 15, the following -Werror warning is produced:

    sys/dev/xen/blkback/blkback.c:1561:12: error: variable 'req_seg_idx' set but not used [-Werror,-Wunused-but-set-variable]
                    u_int                    req_seg_idx;
                                             ^

The 'req_seg_idx' variable was used in the for loop later in the
xbb_dispatch_io() function, but refactoring in 112cacaee408 got rid of
it. Remove the variable since it no longer serves any purpose.

MFC after:	3 days

(cherry picked from commit 39e12a7591bf2ed4b2fae48e19f3af3a3cdcb196)

Git Hash:   356dccddae4d406dc83f5aeb109b75abb30d4d21
Git Author: dim@FreeBSD.org
END