mm/mempolicy: fix get_nodes out of bound access
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 v5.15.61 by commit 44652154484e7e3d12008802cfb6c28a8aa16d85, it was introduced in version v5.15 by commit e130242dc351f1cfa2bbeb6766a1486ce936ef88. For more details please see the references link.