us_timer_ext in libuv.c returns wrong pointer

[AdrianEddy]

Looks like us_timer_ext in libuv.c returns pointer to uv_timer_t instead of a pointer past uv_timer_t, to actual ext data

I ran into issues using timers with libuv on windows and changing the us_timer_ext code to:

void *us_timer_ext(struct us_timer_t *timer) {
    return ((char *) timer) + sizeof(struct us_internal_callback_t) + sizeof(uv_timer_t);
}

fixed the issue

[ghost]

Fixed, thanks