xfs: make use of XFS_SB_LOG_RES() at xfs_mount_log_sb()

Make use of XFS_SB_LOG_RES() at xfs_mount_log_sb().
Signed-off-by: Jie Liu <jeff.liu@oracle.com>
CC: Dave Chinner <david@fromorbit.com>
Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>

fs/xfs/xfs_mount.c

@@ -1945,7 +1945,7 @@ xfs_mount_log_sb(
 			 XFS_SB_VERSIONNUM));
 
 	tp = xfs_trans_alloc(mp, XFS_TRANS_SB_UNIT);
-	error = xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0,
+	error = xfs_trans_reserve(tp, 0, XFS_SB_LOG_RES(mp), 0, 0,
 				  XFS_DEFAULT_LOG_COUNT);
 	if (error) {
 		xfs_trans_cancel(tp, 0);