给定单链表头结点head和整数val，需删除链表中所有值等于val的节点并返回新头结点，现有Python代码如下，请补全横线处的内容：

class ListNode:
    def __init__(self, val=0, next=None):
        self.val = val
        self.next = next

def removeElements(head: ListNode, val: int) -> ListNode:
    dummy = ListNode(0, head)
    cur = dummy
    while cur.next:
        if cur.next.val == val:
            _________________________
            del del_node
        else:
            cur = cur.next
    return dummy.next