xfs: clean up scrub usage of KM_NOFS

All scrub code runs in transaction context, which means that memory
allocations are automatically run in PF_MEMALLOC_NOFS context.  It's
therefore unnecessary to pass in KM_NOFS to allocation routines, so
clean them all out.
Signed-off-by: NDarrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: NBrian Foster <bfoster@redhat.com>

fs/xfs/scrub/agheader.c

@@ -797,7 +797,8 @@ xfs_scrub_agfl(
 	}
 	memset(&sai, 0, sizeof(sai));
 	sai.sz_entries = agflcount;
-	sai.entries = kmem_zalloc(sizeof(xfs_agblock_t) * agflcount, KM_NOFS);
+	sai.entries = kmem_zalloc(sizeof(xfs_agblock_t) * agflcount,
+			KM_MAYFAIL);
 	if (!sai.entries) {
 		error = -ENOMEM;
 		goto out;

fs/xfs/scrub/btree.c

@@ -442,7 +442,7 @@ xfs_scrub_btree_check_owner(
 	 */
 	if (cur->bc_btnum == XFS_BTNUM_BNO || cur->bc_btnum == XFS_BTNUM_RMAP) {
 		co = kmem_alloc(sizeof(struct check_owner),
-				KM_MAYFAIL | KM_NOFS);
+				KM_MAYFAIL);
 		if (!co)
 			return -ENOMEM;
 		co->level = level;

fs/xfs/scrub/refcount.c

@@ -150,7 +150,7 @@ xfs_scrub_refcountbt_rmap_check(
 		 * so we don't need insertion sort here.
 		 */
 		frag = kmem_alloc(sizeof(struct xfs_scrub_refcnt_frag),
-				KM_MAYFAIL | KM_NOFS);
+				KM_MAYFAIL);
 		if (!frag)
 			return -ENOMEM;
 		memcpy(&frag->rm, rec, sizeof(frag->rm));