staging: iio: dummy: 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>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/iio/iio_dummy_evgen.c

@@ -202,6 +202,7 @@ static struct device iio_evgen_dev = {
 static __init int iio_dummy_evgen_init(void)
 {
 	int ret = iio_dummy_evgen_create();
+
 	if (ret < 0)
 		return ret;
 	device_initialize(&iio_evgen_dev);

drivers/staging/iio/iio_simple_dummy_buffer.c

@@ -71,6 +71,7 @@ static irqreturn_t iio_simple_dummy_trigger_h(int irq, void *p)
 		 * in the constant table fakedata.
 		 */
 		int i, j;
+
 		for (i = 0, j = 0;
 		     i < bitmap_weight(indio_dev->active_scan_mask,
 				       indio_dev->masklength);

drivers/staging/iio/iio_simple_dummy_events.c

@@ -148,6 +148,7 @@ int iio_simple_dummy_write_event_value(struct iio_dev *indio_dev,
 static irqreturn_t iio_simple_dummy_event_handler(int irq, void *private)
 {
 	struct iio_dev *indio_dev = private;
+
 	iio_push_event(indio_dev,
 		       IIO_EVENT_CODE(IIO_VOLTAGE, 0, 0,
 				      IIO_EV_DIR_RISING,