[media] media: i2c: Convert to devm_kzalloc()

Using the managed function the kfree() calls can be removed from the
probe error path and the remove handler.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Acked-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/i2c/adv7180.c b/drivers/media/i2c/adv7180.c
index afd561a..3d14567 100644
--- a/drivers/media/i2c/adv7180.c
+++ b/drivers/media/i2c/adv7180.c
@@ -555,7 +555,7 @@
 	v4l_info(client, "chip found @ 0x%02x (%s)\n",
 		 client->addr, client->adapter->name);
 
-	state = kzalloc(sizeof(struct adv7180_state), GFP_KERNEL);
+	state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
 	if (state == NULL) {
 		ret = -ENOMEM;
 		goto err;
@@ -582,7 +582,6 @@
 err_unreg_subdev:
 	mutex_destroy(&state->mutex);
 	v4l2_device_unregister_subdev(sd);
-	kfree(state);
 err:
 	printk(KERN_ERR KBUILD_MODNAME ": Failed to probe: %d\n", ret);
 	return ret;
@@ -607,7 +606,6 @@
 
 	mutex_destroy(&state->mutex);
 	v4l2_device_unregister_subdev(sd);
-	kfree(to_state(sd));
 	return 0;
 }