Remove Duplicates from list

Write a RemoveDuplicates() function which takes a list sorted in increasing order and deletes any duplicate nodes from the list. Ideally, the list should only be traversed once.
 

/*
 * Remove duplicates from a sorted list
 */
void RemoveDuplicates(nodeptr head)
{
    nodeptr current = head;
    nodeptr tempnode;
    while(current != NULL) {
        if(current->next != NULL) {
            if(current->data == current->next->data) {
                tempnode = current->next;
                current->next = tempnode->next;
                free(tempnode);
            }
        }
        current = current->next;
    }
}