xfs: fix u32 type usage in sb validation function

Don't use u32, use uint32_t, because this won't work in xfsprogs.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>

fs/xfs/libxfs/xfs_sb.c

@@ -118,8 +118,8 @@ xfs_mount_validate_sb(
 	bool		check_inprogress,
 	bool		check_version)
 {
-	u32		agcount = 0;
-	u32		rem;
+	uint32_t	agcount = 0;
+	uint32_t	rem;
 
 	if (sbp->sb_magicnum != XFS_SB_MAGIC) {
 		xfs_warn(mp, "bad magic number");