[Bug 264631] RDMA/mlx5: Fix memory leak in error flow for subscribe event

From: <bugzilla-noreply_at_freebsd.org>
Date: Sun, 12 Jun 2022 11:55:27 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264631

            Bug ID: 264631
           Summary: RDMA/mlx5: Fix memory leak in error flow for subscribe
                    event
           Product: Base System
           Version: Unspecified
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: xiaohuizhang@ruc.edu.cn

Created attachment 234637
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=234637&action=edit
a possible patch

In case the second xa_insert() fails, the obj_event is not released.  Fix 
the error unwind flow to free that memory to avoid a memory leak.

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