iio: Remove unnecessary casts for iio_push_to_buffers()

Now that iio_push_to_buffers() takes a void pointer for the data parameter we
can remove those casts to u8*.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/iio/gyro/itg3200_buffer.c

@@ -59,7 +59,7 @@ static irqreturn_t itg3200_trigger_handler(int irq, void *p)
 		memcpy(buf + indio_dev->scan_bytes - sizeof(s64),
 				&pf->timestamp, sizeof(pf->timestamp));
 
-	iio_push_to_buffers(indio_dev, (u8 *)buf);
+	iio_push_to_buffers(indio_dev, buf);
 	iio_trigger_notify_done(indio_dev->trig);
 
 error_ret: