Function decode_fail

common/bolt11.c:118–127

	PRINTF_FMT(3,4);

static struct bolt11 *decode_fail(struct bolt11 *b11, const char **fail,
				  const char *fmt, ...)
{
	va_list ap;

	va_start(ap, fmt);
	*fail = tal_vfmt(tal_parent(b11), fmt, ap);
	va_end(ap);
	return tal_free(b11);
}

/*
 * These handle specific fields in the payment request; returning the problem