staging:iio: Don't compare boolean values with true/false

Fixes the following coccicheck warnings:
	drivers/staging/iio/accel/lis3l02dq_ring.c:240:5-10: WARNING: Comparison to bool
	drivers/staging/iio/iio_dummy_evgen.c:111:6-25: WARNING: Comparison to bool
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/staging/iio/accel/lis3l02dq_ring.c

@@ -237,7 +237,7 @@ static int lis3l02dq_data_rdy_trigger_set_state(struct iio_trigger *trig,
 	u8 t;
 
 	__lis3l02dq_write_data_ready_config(indio_dev, state);
-	if (state == false) {
+	if (!state) {
 		/*
 		 * A possible quirk with the handler is currently worked around
 		 * by ensuring outstanding read events are cleared.

drivers/staging/iio/iio_dummy_evgen.c

@@ -108,7 +108,7 @@ int iio_dummy_evgen_get_irq(void)
 
 	mutex_lock(&iio_evgen->lock);
 	for (i = 0; i < IIO_EVENTGEN_NO; i++)
-		if (iio_evgen->inuse[i] == false) {
+		if (!iio_evgen->inuse[i]) {
 			ret = iio_evgen->base + i;
 			iio_evgen->inuse[i] = true;
 			break;