Revert "Remove a useless memory write in zend_llist_del_element"

This reverts commit fad960a as
required by Stas and Christopher

Zend/zend_llist.c

@@ -91,13 +91,15 @@ ZEND_API void zend_llist_prepend_element(zend_llist *l, void *element)
 ZEND_API void zend_llist_del_element(zend_llist *l, void *element, int (*compare)(void *element1, void *element2))
 {
 	zend_llist_element *current=l->head;
+	zend_llist_element *next;
 
 	while (current) {
+		next = current->next;
 		if (compare(current->data, element)) {
 			DEL_LLIST_ELEMENT(current, l);
 			break;
 		}
-		current = current->next;
+		current = next;
 	}
 }