staging: lustre: ldlm: use list_first_entry in ldlm_lock

This make the code (slightly) more readable.
Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/ldlm/ldlm_lock.c

@@ -1687,7 +1687,7 @@ ldlm_work_bl_ast_lock(struct ptlrpc_request_set *rqset, void *opaq)
 	if (list_empty(arg->list))
 		return -ENOENT;
 
-	lock = list_entry(arg->list->next, struct ldlm_lock, l_bl_ast);
+	lock = list_first_entry(arg->list, struct ldlm_lock, l_bl_ast);
 
 	/* nobody should touch l_bl_ast */
 	lock_res_and_lock(lock);
@@ -1723,7 +1723,7 @@ ldlm_work_cp_ast_lock(struct ptlrpc_request_set *rqset, void *opaq)
 	if (list_empty(arg->list))
 		return -ENOENT;
 
-	lock = list_entry(arg->list->next, struct ldlm_lock, l_cp_ast);
+	lock = list_first_entry(arg->list, struct ldlm_lock, l_cp_ast);
 
 	/* It's possible to receive a completion AST before we've set
 	 * the l_completion_ast pointer: either because the AST arrived
@@ -1769,7 +1769,7 @@ ldlm_work_revoke_ast_lock(struct ptlrpc_request_set *rqset, void *opaq)
 	if (list_empty(arg->list))
 		return -ENOENT;
 
-	lock = list_entry(arg->list->next, struct ldlm_lock, l_rk_ast);
+	lock = list_first_entry(arg->list, struct ldlm_lock, l_rk_ast);
 	list_del_init(&lock->l_rk_ast);
 
 	/* the desc just pretend to exclusive */
@@ -1796,7 +1796,7 @@ static int ldlm_work_gl_ast_lock(struct ptlrpc_request_set *rqset, void *opaq)
 	if (list_empty(arg->list))
 		return -ENOENT;
 
-	gl_work = list_entry(arg->list->next, struct ldlm_glimpse_work,
+	gl_work = list_first_entry(arg->list, struct ldlm_glimpse_work,
 			     gl_list);
 	list_del_init(&gl_work->gl_list);