staging: rtl8723bs: os_dep: remove set but not used 'uintRet'

Fix the following gcc warning:

drivers/staging/rtl8723bs/os_dep/ioctl_linux.c:2564:22: warning:
variable ‘uintRet’ set but not used [-Wunused-but-set-variable]
         unsigned int uintRet = 0;
                      ^~~~~~~
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Jason Yan <yanaijie@huawei.com>
Link: https://lore.kernel.org/r/20200427032342.27211-2-yanaijie@huawei.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8723bs/os_dep/ioctl_linux.c

@@ -2561,14 +2561,16 @@ static int rtw_wps_start(struct net_device *dev,
 	struct adapter *padapter = (struct adapter *)rtw_netdev_priv(dev);
 	struct iw_point *pdata = &wrqu->data;
 	u32   u32wps_start = 0;
-        unsigned int uintRet = 0;
 
 	if ((true == padapter->bDriverStopped) || (true == padapter->bSurpriseRemoved) || (NULL == pdata)) {
 		ret = -EINVAL;
 		goto exit;
 	}
 
-	uintRet = copy_from_user((void *)&u32wps_start, pdata->pointer, 4);
+	if (copy_from_user((void *)&u32wps_start, pdata->pointer, 4)) {
+		ret = -EFAULT;
+		goto exit;
+	}
 	if (u32wps_start == 0)
 		u32wps_start = *extra;