4. [Dynamic Data Structures] The following function tries to insert an element at the end of a linked list. There is/are some bug(s) with the code snippet below. Can you IDENTIFY AND CORRECT the bug(s)? You should NOT change the arguments or the return type of this function. You may assume that the call to malloc() is successful. For all error(s) you identify, you should explain the reason for why it is a problem. [6 points] .