GSD-2022-1000995 mm/sparsemem: fix 'mem_section' will never be NULL gcc 12 warning

mm/sparsemem: fix 'memsection' will never be NULL gcc 12 warning 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 v5.17.3 by commit...