liquidio: use list_empty_careful in lio_list_delete_head

Use list_empty_careful() instead of open-coding.
Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/cavium/liquidio/octeon_network.h

@@ -612,7 +612,7 @@ static inline struct list_head *lio_list_delete_head(struct list_head *root)
 {
 	struct list_head *node;
 
-	if (root->prev == root && root->next == root)
+	if (list_empty_careful(root))
 		node = NULL;
 	else
 		node = root->next;