func RemoveByValue in doublylinkedlist.go may have one problem

[tmac33]

the block as below

current := list.head
	for current.next != nil {
		if current.next.data == i {
			if current.next.next != nil {
				current.next.next.prev = current
			}
			current.next = current.next.next
			return true
		}
		current = current.next
	}

there should no current.next.next==nil condition, if current.next.next==nil, then current.next will be the list.tail