staging: fieldbus: arcx-anybus: Do not check 0 for platform_get_irq()

Since platform_get_irq() never returned zero, so it need not to check
whether it returned zero, and we use the return error code of
platform_get_irq() to replace the current return error code, for that
platform_get_irq() may return -EINVAL or -ENXIO.

Signed-off-by: Zhu Wang <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/fieldbus/anybuss/arcx-anybus.c

···
 	if (IS_ERR(ops.regmap))
 		return ERR_CAST(ops.regmap);
 	ops.irq = platform_get_irq(pdev, idx);
-	if (ops.irq <= 0)
-		return ERR_PTR(-EINVAL);
+	if (ops.irq < 0)
+		return ERR_PTR(ops.irq);
 	return devm_anybuss_host_common_probe(&pdev->dev, &ops);
 }