RDMA/mlx5: Fix memory leak in error flow for subscribe event routine
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 v5.15.33 by commit 8dd392e352d3269938fea32061a74655a613f929, it was introduced in version v5.3 by commit 7597385371425febdaa8c6a1da3625d4ffff16f5. For more details please see the references link.