mm/mempolicy: fix mpolnew leak in sharedpolicy_replace
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 v5.4.189 by commit 25f506273b6ae806fd46bfcb6fdaa5b9ec81a05b, it was introduced in version v3.8 by commit 42288fe366c4f1ce7522bc9f27d0bc2a81c55264. For more details please see the references link.