Fix native_handle_create to check if malloc fails

    native_handle_t* h = malloc(

            sizeof(native_handle_t) + sizeof(int)*(numFds+numInts));

    if (h) {

        h->version = sizeof(native_handle_t);

        h->numFds = numFds;

        h->numInts = numInts;

    }

    return h;

}