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 v5.10.159 by commit 6a4da05acd062ae7774b6b19cef2b7d922902d36, it was introduced in version v5.2 by commit 2194a63a818db71065ebe09c8104f5f021ca4e7b. For more details please see the references link.