[PATCH v4] media: i2c: rdacm21: Fix missing media_entity_cleanup()

[Biren Pandya <birenpandya@gmail.com>]

If an error occurs after media_entity_pads_init() is called, the media
entity is left uncleaned, potentially leaking resources or leaving it
in an invalid state. Similarly, the remove path misses the cleanup.

Add a dedicated error_entity_cleanup label so that media_entity_cleanup()
is only invoked on the error path when media_entity_pads_init() has
actually succeeded. Also add media_entity_cleanup() to rdacm21_remove()
to ensure proper resource release on driver unload.

Fixes: a59f853b3b4b ("media: i2c: Add driver for RDACM21 camera module")
Signed-off-by: Biren Pandya <birenpandya@gmail.com>
---
Changes in v4:
- Rebased onto latest linux-media next branch to resolve a merge conflict in rdacm21.c (as reported by Media CI).

Changes in v3:
- Added a blank line after media_entity_cleanup() in the error path (Sakari).

Changes in v2:
- Fixed a bug in v1's probe error handling where media_entity_cleanup()
  could be called on an uninitialized entity.
- Added Signed-off-by tag which was missing in v1.
---
 drivers/media/i2c/rdacm21.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/media/i2c/rdacm21.c b/drivers/media/i2c/rdacm21.c
index bcab462708c70..531b71d0a94df 100644
--- a/drivers/media/i2c/rdacm21.c
+++ b/drivers/media/i2c/rdacm21.c
@@ -588,10 +588,13 @@ static int rdacm21_probe(struct i2c_client *client)
 
 	ret = v4l2_async_register_subdev(&dev->sd);
 	if (ret)
-		goto error_free_ctrls;
+		goto error_entity_cleanup;
 
 	return 0;
 
+error_entity_cleanup:
+	media_entity_cleanup(&dev->sd.entity);
+
 error_free_ctrls:
 	v4l2_ctrl_handler_free(&dev->ctrls);
 error:
-- 
2.50.1 (Apple Git-155)