gpio: cdev: Fix resource leaks on errors in lineinfo_changed_notify()

gpio: cdev: Fix resource leaks on errors in lineinfo_changed_notify()

On error handling paths, lineinfo_changed_notify() doesn't free the
allocated resources which results leaks.  Fix it.

Cc: stable@vger.kernel.org
Fixes: d4cd0902c156 ("gpio: cdev: make sure the cdev fd is still active before emitting events")
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
Link: https://lore.kernel.org/r/20260120030857.2144847-1-tzungbi@kernel.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>