[patch] iio: test for failed allocation

[Dan Carpenter]

We should return test to see if iio_allocate_trigger() fails and return -ENOMEM.

Signed-off-by: Dan Carpenter <error27 at gmail.com>

diff --git a/drivers/staging/iio/accel/lis3l02dq_ring.c b/drivers/staging/iio/accel/lis3l02dq_ring.c
index a6b7c72..db3270f 100644
--- a/drivers/staging/iio/accel/lis3l02dq_ring.c
+++ b/drivers/staging/iio/accel/lis3l02dq_ring.c
@@ -492,6 +492,9 @@ int lis3l02dq_probe_trigger(struct iio_dev *indio_dev)
 	struct lis3l02dq_state *state = indio_dev->dev_data;
 
 	state->trig = iio_allocate_trigger();
+	if (!state->trig)
+		return -ENOMEM;
+
 	state->trig->name = kmalloc(IIO_TRIGGER_NAME_LENGTH, GFP_KERNEL);
 	if (!state->trig->name) {
 		ret = -ENOMEM;