power: reset: gemini-poweroff: Fix IRQ check in gemini_poweroff_probe

platform_get_irq() returns negative error number instead 0 on failure.
And the doc of platform_get_irq() provides a usage example:

int irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;

Fix the check of return value to catch errors correctly.

Fixes: f7a388d6cd1c ("power: reset: Add a driver for the Gemini poweroff")
Signed-off-by: Miaoqian Lin <[e-mail]>
Reviewed-by: Linus Walleij <[e-mail]>
Signed-off-by: Sebastian Reichel <[e-mail]>

drivers/power/reset/gemini-poweroff.c

···
 		return PTR_ERR(gpw->base);
 
 	irq = platform_get_irq(pdev, 0);
-	if (!irq)
-		return -EINVAL;
+	if (irq < 0)
+		return irq;
 
 	gpw->dev = dev;