xfs: fix a comment in xfs_log_reserve

Fix the comment in xfs_log_reserve to avoid confusing.

Signed-of-by: Huang Chong <huang.chong@zte.com.cn>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

fs/xfs/xfs_log.c

@@ -410,7 +410,7 @@ out_error:
 }
 
 /*
- * Reserve log space and return a ticket corresponding the reservation.
+ * Reserve log space and return a ticket corresponding to the reservation.
  *
  * Each reservation is going to reserve extra space for a log record header.
  * When writes happen to the on-disk log, we don't subtract the length of the