staging/rts_pstor: remove braces {} in sd.c (sd_stop_seq_mode)

fixed below checkpatch warnings.
-WARNING: braces {} are not necessary for single statement blocks
Signed-off-by: Toshiaki Yamane <yamanetoshi@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rts_pstor/sd.c

@@ -3127,19 +3127,18 @@ void sd_stop_seq_mode(struct rtsx_chip *chip)
 
 	if (sd_card->seq_mode) {
 		retval = sd_switch_clock(chip);
-		if (retval != STATUS_SUCCESS) {
+		if (retval != STATUS_SUCCESS)
 			return;
-		}
 
 		retval = sd_send_cmd_get_rsp(chip, STOP_TRANSMISSION, 0,
 				SD_RSP_TYPE_R1b, NULL, 0);
-		if (retval != STATUS_SUCCESS) {
+		if (retval != STATUS_SUCCESS)
 			sd_set_err_code(chip, SD_STS_ERR);
-		}
+
 		retval = sd_wait_state_data_ready(chip, 0x08, 1, 1000);
-		if (retval != STATUS_SUCCESS) {
+		if (retval != STATUS_SUCCESS)
 			sd_set_err_code(chip, SD_STS_ERR);
-		}
+
 		sd_card->seq_mode = 0;
 
 		rtsx_write_register(chip, RBCTL, RB_FLUSH, RB_FLUSH);