Staging: iio: trigger: Use braces on both branches of if statement

Fix style issue related to missing braces, detected by checkpatch.pl.
Signed-off-by: Cristina Opriceana <cristina.opriceana@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/staging/iio/trigger/iio-trig-periodic-rtc.c

@@ -74,8 +74,9 @@ static ssize_t iio_trig_periodic_write_freq(struct device *dev,
 		if (ret == 0 && trig_info->state && trig_info->frequency == 0)
 			ret = rtc_irq_set_state(trig_info->rtc,
 						&trig_info->task, 1);
-	} else
+	} else {
 		ret = rtc_irq_set_state(trig_info->rtc, &trig_info->task, 0);
+	}
 	if (ret)
 		goto error_ret;