Remove Linked List Elements

PROBLEM :

Remove all elements from a linked list of integers that have value val.

Example
Given: 1 --> 2 --> 6 --> 3 --> 4 --> 5 --> 6, val = 6
Return: 1 --> 2 --> 3 --> 4 --> 5

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SIMPLE c++ IMPLEMENTATION :
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/**
 * Definition for singly-linked list.
 * struct ListNode {
 *     int val;
 *     struct ListNode *next;
 * };
 */
struct ListNode* removeElements(struct ListNode* head, int val) {
   
    struct ListNode *temp,*ptr ;
   
    if(head==NULL)
        return head ;

    while(head!=NULL&&head->val==val)
    {
        ptr=head ;
        head=ptr->next ;
        free(ptr) ;
    }
   
    if(head==NULL)
        return head ;
   
    temp=head ;
    while(temp->next!=NULL)
    {
        if(temp->next->val==val)
        {
            ptr=temp->next ;
            temp->next=ptr->next ;
            free(ptr) ;
        }
        else
            temp=temp->next ;
    }
   
    return head ;
}

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