NVIDIA/gdrcopy v2.4.4

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This is a quick hotfix release.

Users are strongly encouraged to upgrade to this release in order to avoid potential CPU and GPU memory leaks, i.e. possibly associated to the ungraceful termination of multi-process applications.

The changes below have been fixed in the master branch and are being backported to the R2.4 branch:

• Fix a use-after-free bug of mr objects in gdrdv_vma_close(), see #314.
• Fix a resource leak in gdrdrv_release, see #313.