GSD-2022-1000354 libsubcmd: Fix use-after-free for realloc(..., 0)

libsubcmd: Fix use-after-free for realloc..., 0 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 v5.4.181 by commit...