staging: iio: trigger: add blank lines after declarations

This fixes the following checkpatch.pl warning:
WARNING: Missing a blank line after declarations.
Signed-off-by: Catalina Mocanu <catalina.mocanu@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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

@@ -33,6 +33,7 @@ static int iio_trig_periodic_rtc_set_state(struct iio_trigger *trig, bool state)
 {
 	struct iio_prtc_trigger_info *trig_info = iio_trigger_get_drvdata(trig);
 	int ret;
+
 	if (trig_info->frequency == 0 && state)
 		return -EINVAL;
 	dev_dbg(&trig_info->rtc->dev, "trigger frequency is %d\n",
@@ -50,6 +51,7 @@ static ssize_t iio_trig_periodic_read_freq(struct device *dev,
 {
 	struct iio_trigger *trig = to_iio_trigger(dev);
 	struct iio_prtc_trigger_info *trig_info = iio_trigger_get_drvdata(trig);
+
 	return sprintf(buf, "%u\n", trig_info->frequency);
 }
 
@@ -183,6 +185,7 @@ static int iio_trig_periodic_rtc_remove(struct platform_device *dev)
 {
 	struct iio_trigger *trig, *trig2;
 	struct iio_prtc_trigger_info *trig_info;
+
 	mutex_lock(&iio_prtc_trigger_list_lock);
 	list_for_each_entry_safe(trig,
 				 trig2,