xfs: fix backwards endian conversion in scrub

mainline inclusion
from mainline-5.1-rc1
commit 3d129e1be3d941d9b1d7509d046307ec350fb535
category: bugfix
bugzilla: 19005
CVE: NA

---------------------------

Fix a backwards endian conversion of a constant.
Signed-off-by: NDarrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: NAllison Henderson <allison.henderson@oracle.com>
Signed-off-by: Nzhengbin <zhengbin13@huawei.com>
Reviewed-by: Nyu kuai <yukuai3@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

fs/xfs/scrub/agheader.c

@@ -401,7 +401,7 @@ xchk_agf_xref_cntbt(
 	if (!xchk_should_check_xref(sc, &error, &sc->sa.cnt_cur))
 		return;
 	if (!have) {
-		if (agf->agf_freeblks != be32_to_cpu(0))
+		if (agf->agf_freeblks != cpu_to_be32(0))
 			xchk_block_xref_set_corrupt(sc, sc->sa.agf_bp);
 		return;
 	}