firmware: qcom: scm: fix bogus irq error at probe

A recent commit added support for an optional interrupt which is only
available on some platforms.

Stop spamming the logs with bogus error messages on platforms that do
not use this new optional resource:

	qcom_scm firmware:scm: error -ENXIO: IRQ index 0 not found

Fixes: 6bf3259 ("firmware: qcom: scm: Add wait-queue handling logic")
Cc: Guru Das Srinagesh <[email protected]>
Cc: Sibi Sankar <[email protected]>
Signed-off-by: Johan Hovold <[email protected]>
Tested-by: Steev Klimaszewski <[email protected]> # Thinkpad X13s
Acked-by: Guru Das Srinagesh <[email protected]>
Reviewed-by: Konrad Dybcio <[email protected]>
Signed-off-by: Bjorn Andersson <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: jhovold

drivers/firmware/qcom_scm.c

@@ -1479,7 +1479,7 @@ static int qcom_scm_probe(struct platform_device *pdev)
 
 	init_completion(&__scm->waitq_comp);
 
-	irq = platform_get_irq(pdev, 0);
+	irq = platform_get_irq_optional(pdev, 0);
 	if (irq < 0) {
 		if (irq != -ENXIO)
 			return irq;