mmc: rtsx_usb_sdmmc: Remove the unneeded result variable

Return the value rtsx_usb_send_cmd() directly instead of storing it in
another redundant variable.
Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: ye xingchen <ye.xingchen@zte.com.cn>
Link: https://lore.kernel.org/r/20220920064648.215375-1-ye.xingchen@zte.com.cnSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/rtsx_usb_sdmmc.c

@@ -1042,7 +1042,6 @@ static int sd_set_timing(struct rtsx_usb_sdmmc *host,
 		unsigned char timing, bool *ddr_mode)
 {
 	struct rtsx_ucr *ucr = host->ucr;
-	int err;
 
 	*ddr_mode = false;
 
@@ -1097,9 +1096,7 @@ static int sd_set_timing(struct rtsx_usb_sdmmc *host,
 		break;
 	}
 
-	err = rtsx_usb_send_cmd(ucr, MODE_C, 100);
-
-	return err;
+	return rtsx_usb_send_cmd(ucr, MODE_C, 100);
 }
 
 static void sdmmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)