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: 605f72d ("iio: accel: mma8452: improvements to handle
multiple events")

Signed-off-by: Leonard Crestez <[email protected]>
cc: <[email protected]>
Signed-off-by: Jonathan Cameron <[email protected]>

Author: cdleonard

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) {