apparmor: fix a memleak in multitransactionnew()
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 v6.0.16 by commit 88989932c2269ea66074f52a6213598838f8b9e7, it was introduced in version v4.13 by commit 1dea3b41e84c5923173fe654dcb758a5cb4a46e5. For more details please see the references link.