Remove Duplicate From Sorted Linked List

/**
 * Definition for singly-linked list.
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode() {}
 *     ListNode(int val) { this.val = val; }
 *     ListNode(int val, ListNode next) { this.val = val; this.next = next; }
 * }
 */
class Solution {
    public ListNode deleteDuplicates(ListNode head) {
       if(head == null){
           return head;
       }

       ListNode curr = head;

       while(curr.next != null){
           if(curr.val == curr.next.val){
               curr.next = curr.next.next;
           }
           else{
               curr = curr.next;
           }
       }
        return head;
    }
}