xfs: fix the comment of xfs_setsize_buftarg_early()

Signed-off-by: NZhi Yong Wu <wuzhy@linux.vnet.ibm.com>
Reviewed-by: NMark Tinguely <tinguely@sgi.com>
Signed-off-by: NBen Myers <bpm@sgi.com>

fs/xfs/xfs_buf.c

@@ -1622,7 +1622,7 @@ xfs_setsize_buftarg_flags(
 /*
  *	When allocating the initial buffer target we have not yet
  *	read in the superblock, so don't know what sized sectors
- *	are being used is at this early stage.  Play safe.
+ *	are being used at this early stage.  Play safe.
  */
 STATIC int
 xfs_setsize_buftarg_early(