mmc: rtsx_usb_sdmmc: simplify the return expression of sd_change_phase()

Simplify the return expression.

Signed-off-by: Qinglang Miao <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Ulf Hansson <[e-mail]>

drivers/mmc/host/rtsx_usb_sdmmc.c

···
 static int sd_change_phase(struct rtsx_usb_sdmmc *host, u8 sample_point, int tx)
 {
 	struct rtsx_ucr *ucr = host->ucr;
-	int err;
 
 	dev_dbg(sdmmc_dev(host), "%s: %s sample_point = %d\n",
 			__func__, tx ? "TX" : "RX", sample_point);
···
 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, CLK_DIV, CLK_CHANGE, 0);
 	rtsx_usb_add_cmd(ucr, WRITE_REG_CMD, SD_CFG1, SD_ASYNC_FIFO_RST, 0);
 
-	err = rtsx_usb_send_cmd(ucr, MODE_C, 100);
-	if (err)
-		return err;
-
-	return 0;
+	return rtsx_usb_send_cmd(ucr, MODE_C, 100);
 }
 
 static inline u32 get_phase_point(u32 phase_map, unsigned int idx)