21. Merge Two Sorted Lists

[D]

Line 98: Char 37: cannot use param_1 (type *leetcode.ListNode) as type *ListNode in argument to __helper__ (solution.go)
Line 98: Char 37: cannot use param_2 (type *leetcode.ListNode) as type *ListNode in argument to __helper__ (solution.go)

https://github.com/aQuaYi/LeetCode-in-Go/blob/master/Algorithms/0021.merge-two-sorted-lists/merge-two-sorted-lists.go#L1