xfs: ensure xfs_errortag_random_default matches XFS_ERRTAG_MAX

commit b2c2974 upstream.

Add the BUILD_BUG_ON to xfs_errortag_add() in order to make sure that
the length of xfs_errortag_random_default matches XFS_ERRTAG_MAX when
building.

Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Acked-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

fs/xfs/xfs_error.c

@@ -293,6 +293,8 @@ xfs_errortag_add(
 	struct xfs_mount	*mp,
 	unsigned int		error_tag)
 {
+	BUILD_BUG_ON(ARRAY_SIZE(xfs_errortag_random_default) != XFS_ERRTAG_MAX);
+
 	if (error_tag >= XFS_ERRTAG_MAX)
 		return -EINVAL;