xfs: remove the unused bv field in struct xfs_gc_bio

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
Reviewed-by: Hans Holmberg <hans.holmberg@wdc.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Carlos Maiolino <cem@kernel.org>

Author: Christoph Hellwig

fs/xfs/xfs_zone_gc.c

@@ -117,7 +117,6 @@ struct xfs_gc_bio {
 	struct xfs_rtgroup		*victim_rtg;
 
 	/* Bio used for reads and writes, including the bvec used by it */
-	struct bio_vec			bv;
 	struct bio			bio;	/* must be last */
 };