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 <yongjun_wei@trendmicro.com.cn>
Reviewed-by: Jingoo Han <jg1.han@samsung.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

drivers/mmc/host/sdhci-acpi.c

@@ -189,8 +189,10 @@ static int sdhci_acpi_add_own_cd(struct device *dev, int gpio,
 		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);