xfs: fix the comment above xfs_discard_endio

pagb_lock has been replaced with eb_lock.

Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Darrick J. Wong <[email protected]>
Signed-off-by: Carlos Maiolino <[email protected]>

Author: Christoph Hellwig

fs/xfs/xfs_discard.c

@@ -90,7 +90,7 @@ xfs_discard_endio_work(
 
 /*
  * Queue up the actual completion to a thread to avoid IRQ-safe locking for
- * pagb_lock.
+ * eb_lock.
  */
 static void
 xfs_discard_endio(