staging:iio:adis16260: Do not return error code in the interrupt handler

The interrupt handler should only ever return one of the three irqreturn_t
constants and not an error code. Also make sure to always call
iio_trigger_notify_done before leaving the trigger handler.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/staging/iio/gyro/adis16260_ring.c

@@ -69,7 +69,7 @@ static irqreturn_t adis16260_trigger_handler(int irq, void *p)
 	data = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
 	if (data == NULL) {
 		dev_err(&st->us->dev, "memory alloc failed in ring bh");
-		return -ENOMEM;
+		goto done;
 	}
 
 	if (!bitmap_empty(indio_dev->active_scan_mask, indio_dev->masklength) &&
@@ -84,8 +84,9 @@ static irqreturn_t adis16260_trigger_handler(int irq, void *p)
 
 	ring->access->store_to(ring, (u8 *)data, pf->timestamp);
 
-	iio_trigger_notify_done(indio_dev->trig);
 	kfree(data);
+done:
+	iio_trigger_notify_done(indio_dev->trig);
 
 	return IRQ_HANDLED;
 }