iio: mma8452: Fix ignoring MMA8452_INT_DRDY

Interrupts are ignored if no event bit is set in the status status
register and this breaks the buffer interface. No data is shown when
running "iio_generic_buffer -n mma8451 -a" and interrupt counts go
crazy.

Fix by not returning IRQ_NONE if DRDY is set.

Fixes: 605f72de ("iio: accel: mma8452: improvements to handle
multiple events")
Signed-off-by: NLeonard Crestez <leonard.crestez@nxp.com>
cc: <Stable@vger.kernel.org>
Signed-off-by: NJonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/accel/mma8452.c

@@ -1053,7 +1053,7 @@ static irqreturn_t mma8452_interrupt(int irq, void *p)
 	if (src < 0)
 		return IRQ_NONE;
 
-	if (!(src & data->chip_info->enabled_events))
+	if (!(src & (data->chip_info->enabled_events | MMA8452_INT_DRDY)))
 		return IRQ_NONE;
 
 	if (src & MMA8452_INT_DRDY) {