staging: lustre: ldlm: use list_first_entry in ldlm_lockd.c

This is only a small simplification, but it makes the code
a little clearer.
Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/ldlm/ldlm_lockd.c

@@ -696,11 +696,11 @@ static int ldlm_bl_get_work(struct ldlm_bl_pool *blp,
 	/* process a request from the blp_list at least every blp_num_threads */
 	if (!list_empty(&blp->blp_list) &&
 	    (list_empty(&blp->blp_prio_list) || num_bl == 0))
-		blwi = list_entry(blp->blp_list.next,
+		blwi = list_first_entry(&blp->blp_list,
 					struct ldlm_bl_work_item, blwi_entry);
 	else
 		if (!list_empty(&blp->blp_prio_list))
-			blwi = list_entry(blp->blp_prio_list.next,
+			blwi = list_first_entry(&blp->blp_prio_list,
 						struct ldlm_bl_work_item,
 						blwi_entry);