iio: Remove redundant check that new trigger is different from old

same check is performed a new lines above
Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/iio/industrialio-trigger.c

@@ -356,7 +356,7 @@ static ssize_t iio_trigger_write_current(struct device *dev,
 
 	indio_dev->trig = trig;
 
-	if (oldtrig && indio_dev->trig != oldtrig)
+	if (oldtrig)
 		iio_trigger_put(oldtrig);
 	if (indio_dev->trig)
 		iio_trigger_get(indio_dev->trig);