[PATCH 0/6] MR5463: mfreadwrite: Test and fix some reference leaks.

[Rémi Bernon (＠rbernon)]

These were probably the cause of crashes of https://gitlab.winehq.org/wine/wine/-/merge_requests/5459 runs on 32bit Linux VMs. Also included some test fixes that were in https://gitlab.winehq.org/wine/wine/-/merge_requests/5459.