drivers/isdn/hardware/mISDN/hfcpci.c compiler warning seems like a BUG

[Jaswinder Singh Rajput <jaswinder@kernel.org>]

I am getting this compiler warning in linus tree :

  CC [M]  drivers/isdn/hardware/mISDN/hfcpci.o
drivers/isdn/hardware/mISDN/hfcpci.c: In function ‘hfcpci_softirq’:
drivers/isdn/hardware/mISDN/hfcpci.c:2333: warning: ignoring return value of ‘driver_for_each_device’, declared with attribute warn_unused_result

static void
hfcpci_softirq(void *arg)
{
        (void) driver_for_each_device(&hfc_driver.driver, NULL, arg,
                                        _hfcpci_softirq);

        /* if next event would be in the past ... */
        if ((s32)(hfc_jiffies + tics - jiffies) <= 0)
                hfc_jiffies = jiffies + 1;
        else
                hfc_jiffies += tics;
        hfc_tl.expires = hfc_jiffies;
        add_timer(&hfc_tl);
}

It seems to me it should return is driver_for_each_device fails :
        if (driver_for_each_device(&hfc_driver.driver, NULL, arg,
                                   _hfcpci_softirq))
		return;

or if possible can we return this error code for hfcpci_softirq()

Thanks,
--
JSR