rtc: ds3231/ds3232: fix coding style

The patch fixes coding style

Signed-off-by: Biwen Li <biwen.li@nxp.com>
diff --git a/drivers/rtc/ds3231.c b/drivers/rtc/ds3231.c
index fde4d86..eb5ce73 100644
--- a/drivers/rtc/ds3231.c
+++ b/drivers/rtc/ds3231.c
@@ -260,10 +260,11 @@
 	struct udevice *dev;
 
 	ret = i2c_get_chip_for_busnum(busnum, chip_addr, 1, &dev);
-	if (!ret)
+	if (!ret) {
 		ret = dm_i2c_reg_write(dev, RTC_STAT_REG_ADDR,
 				       RTC_STAT_BIT_BB32KHZ |
 				       RTC_STAT_BIT_EN32KHZ);
+	}
 	return ret;
 }
 #endif