mmc: sdhci-acpi: fix error return code in sdhci_acpi_add_own_cd()

Fix to return a negative error code in the gpio_to_irq() error
handling case instead of 0, as done elsewhere in this function.

Signed-off-by: Wei Yongjun <[e-mail]>
Reviewed-by: Jingoo Han <[e-mail]>
Acked-by: Adrian Hunter <[e-mail]>
Signed-off-by: Chris Ball <[e-mail]>

drivers/mmc/host/sdhci-acpi.c

···
 		goto out;
 
 	irq = gpio_to_irq(gpio);
-	if (irq < 0)
+	if (irq < 0) {
+		err = irq;
 		goto out_free;
+	}
 
 	flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING;
 	err = devm_request_irq(dev, irq, sdhci_acpi_sd_cd, flags, "sd_cd", mmc);