misc: rtsx: Remove unneeded return variable

This patch removes unneeded return variables, using only
'0' instead.
It fixes the following warning detected by coccinelle:
./drivers/misc/cardreader/rtsx_pcr.c:1808:5-8: Unneeded variable: "ret".
Return "0" on line 1833.
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Link: https://lore.kernel.org/r/1612164640-84541-1-git-send-email-yang.lee@linux.alibaba.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/misc/cardreader/rtsx_pcr.c

@@ -1799,7 +1799,6 @@ static int rtsx_pci_runtime_resume(struct device *device)
 	struct pci_dev *pcidev = to_pci_dev(device);
 	struct pcr_handle *handle;
 	struct rtsx_pcr *pcr;
-	int ret = 0;
 
 	handle = pci_get_drvdata(pcidev);
 	pcr = handle->pcr;
@@ -1824,7 +1823,7 @@ static int rtsx_pci_runtime_resume(struct device *device)
 	schedule_delayed_work(&pcr->idle_work, msecs_to_jiffies(200));
 
 	mutex_unlock(&pcr->pcr_mutex);
-	return ret;
+	return 0;
 }
 
 #else /* CONFIG_PM */