[PATCH 1/3] rcar_can: fix IRQ check

[Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>]

rcar_can_probe() regards 0 as a wrong IRQ #, despite platform_get_irq() that it
calls returns negative error code in that case. This leads to the following
being printed to the console when attempting to open the device:

error requesting interrupt fffffffa

because  rcar_can_open() calls request_irq() with a negative IRQ #, and that
function naturally fails with -EINVAL.

Check for the negative error codes instead and propagate them upstream instead
of just returning -ENODEV.

Fixes: fd1159318e55 ("can: add Renesas R-Car CAN driver")
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>

---
 drivers/net/can/rcar_can.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Index: linux-can/drivers/net/can/rcar_can.c
=================================--- linux-can.orig/drivers/net/can/rcar_can.c
+++ linux-can/drivers/net/can/rcar_can.c
@@ -758,8 +758,9 @@ static int rcar_can_probe(struct platfor
 	}
 
 	irq = platform_get_irq(pdev, 0);
-	if (!irq) {
+	if (irq < 0) {
 		dev_err(&pdev->dev, "No IRQ resource\n");
+		err = irq;
 		goto fail;
 	}
 

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