stratum: parse_notify(): Don't die on malformed bbversion/prev_hash/nbit/ntime.

Might have introduced a memory leak, don't have time to check. :(

Should the other hex2bin()'s be checked?

Thanks to Mick Ayzenberg <mick.dejavusecurity.com> for finding this.
void cgtime(struct timeval *tv)
{
	lldiv_t lidiv;

	decius_time(&lidiv);
	tv->tv_sec = lidiv.quot;
	tv->tv_usec = lidiv.rem / 10;
}

void cgtime(struct timeval *tv)
{
	lldiv_t lidiv;

	decius_time(&lidiv);
	tv->tv_sec = lidiv.quot;
	tv->tv_usec = lidiv.rem / 10;
}
