Input: cpcap-pwrbutton - handle errors from platform_get_irq()

The function cpcap_power_button_probe() does not perform
sufficient error checking after executing platform_get_irq(),
thus fix it.

Signed-off-by: Tang Bin <tangbin@cmss.chinamobile.com>
Link: https://lore.kernel.org/r/20210802121740.8700-1-tangbin@cmss.chinamobile.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/misc/cpcap-pwrbutton.c

@@ -54,9 +54,13 @@ static irqreturn_t powerbutton_irq(int irq, void *_button)
 static int cpcap_power_button_probe(struct platform_device *pdev)
 {
 	struct cpcap_power_button *button;
-	int irq = platform_get_irq(pdev, 0);
+	int irq;
 	int err;
 
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
+
 	button = devm_kmalloc(&pdev->dev, sizeof(*button), GFP_KERNEL);
 	if (!button)
 		return -ENOMEM;