staging:iio:max1363: Do not return error code in 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/adc/max1363_ring.c

@@ -64,11 +64,11 @@ static irqreturn_t max1363_trigger_handler(int irq, void *p)
 	 * no harm.
 	 */
 	if (numvals == 0)
-		return IRQ_HANDLED;
+		goto done;
 
 	rxbuf = kmalloc(d_size,	GFP_KERNEL);
 	if (rxbuf == NULL)
-		return -ENOMEM;
+		goto done;
 	if (st->chip_info->bits != 8)
 		b_sent = i2c_master_recv(st->client, rxbuf, numvals*2);
 	else