can: mcp251x: Use dev_name() during request_threaded_irq()

Passing driver name as name during request_threaded_irq() results in all
CAN IRQs have same name. This does not help much to easily identify which
IRQ belongs to which CAN instance. Therefore pass dev_name() during
request_threaded_irq() so that better identifiable name is listed for
CAN devices in cat /proc/interrupts output.

Output of cat /proc/interrupts
Before this patch:
  253:          2  gpio-mxc  13 Edge      mcp251x
  259:          2  gpio-mxc  19 Edge      mcp251x
After this patch:
  253:          2  gpio-mxc  13 Edge      spi1.1
  259:          2  gpio-mxc  19 Edge      spi1.2
Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Tested-by: Sean Nyekjaer <sean@geanix.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/spi/mcp251x.c

@@ -930,7 +930,8 @@ static int mcp251x_open(struct net_device *net)
 	priv->tx_len = 0;
 
 	ret = request_threaded_irq(spi->irq, NULL, mcp251x_can_ist,
-				   flags | IRQF_ONESHOT, DEVICE_NAME, priv);
+				   flags | IRQF_ONESHOT, dev_name(&spi->dev),
+				   priv);
 	if (ret) {
 		dev_err(&spi->dev, "failed to acquire irq %d\n", spi->irq);
 		goto out_close;