mm/mempolicy: fix uninit-value in mpol_rebind_policy()
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 v5.10.134 by commit ddb3f0b68863bd1c5f43177eea476bce316d4993. For more details please see the references link.