staging/lustre/ldlm: Drop unused blocking_refs flock field

blocking_refs is only used on the server, so drop it on the client.
Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/include/lustre_dlm.h

@@ -550,8 +550,6 @@ struct ldlm_flock {
 	__u64 owner;
 	__u64 blocking_owner;
 	struct obd_export *blocking_export;
-	/* Protected by the hash lock */
-	__u32 blocking_refs;
 	__u32 pid;
 };