[BusyBox] new libb function proposal

[Tito]

Hi,
I would propose to include this new function in libb:

void bb_xioctl(int fd, int request, void *arg, const char *s,... )
{
	va_list p;

	if (ioctl(fd, request, arg) < 0)
	{
		va_start(p, s);
		bb_vperror_msg(s, p);
		va_end(p);
		exit(bb_default_error_retval);
	}
}

as code like:

	if (ioctl(fd, VT_ACTIVATE, num))
		bb_perror_msg_and_die("VT_ACTIVATE");

is common in many busybox applets and so some bytes could be saved.

All opinions about it are welcome!!!!!

Thanks for your time and ciao,
Tito
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