drm/shmem-helper: Remove errant put in error path
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 v5.15.83 by commit 83e3da8bb92fcfa7a1d232cf55f9e6c49bb84942, it was introduced in version v5.2 by commit 2194a63a818db71065ebe09c8104f5f021ca4e7b. For more details please see the references link.