apparmor: fix reference count leak in aa_pivotroot()
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v5.10.138 by commit 2ceeb3296e9dde1d5772348046affcefdea605e2, it was introduced in version v4.14 by commit 2ea3ffb7782a84da33a8382f13ebd016da50079b. For more details please see the references link.