Binary Tree insertion in C

gistfile1.c

void insertNode(TreeNode **root, COMPARE compare, void* data) {
    TreeNode *node = (TreeNode*) malloc(sizeof(TreeNode));
    node->data = data;
    node->left = NULL;
    node->right = NULL;

    if (*root == NULL) {
        *root = node;
        return;
    }

    while (1) {
        if (compare((*root)->data, data) > 0) {
            if ((*root)->left != NULL) {
                *root = (*root)->left;
            } else {
                (*root)->left = node;
                break;
            }
        } else {
            if ((*root)->right != NULL) {
                *root = (*root)->right;
            } else {
                (*root)->right = node;
                break;
            }
        }
    }
}