xfs: misc cleanups for __xfs_btree_check_sblock

Remove the local crc variable that is only used once and remove the bp
NULL checking as it can't ever be NULL for short form blocks.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>

fs/xfs/libxfs/xfs_btree.c

@@ -173,15 +173,13 @@ __xfs_btree_check_sblock(
 {
 	struct xfs_mount	*mp = cur->bc_mp;
 	struct xfs_perag	*pag = cur->bc_ag.pag;
-	bool			crc = xfs_has_crc(mp);
 	xfs_failaddr_t		fa;
-	xfs_agblock_t		agbno = NULLAGBLOCK;
+	xfs_agblock_t		agbno;
 
-	if (crc) {
+	if (xfs_has_crc(mp)) {
 		if (!uuid_equal(&block->bb_u.s.bb_uuid, &mp->m_sb.sb_meta_uuid))
 			return __this_address;
-		if (block->bb_u.s.bb_blkno !=
-		    cpu_to_be64(bp ? xfs_buf_daddr(bp) : XFS_BUF_DADDR_NULL))
+		if (block->bb_u.s.bb_blkno != cpu_to_be64(xfs_buf_daddr(bp)))
 			return __this_address;
 	}
 
@@ -193,9 +191,7 @@ __xfs_btree_check_sblock(
 	    cur->bc_ops->get_maxrecs(cur, level))
 		return __this_address;
 
-	if (bp)
-		agbno = xfs_daddr_to_agbno(mp, xfs_buf_daddr(bp));
-
+	agbno = xfs_daddr_to_agbno(mp, xfs_buf_daddr(bp));
 	fa = xfs_btree_check_sblock_siblings(pag, agbno,
 			block->bb_u.s.bb_leftsib);
 	if (!fa)