[PATCH v4 0/3] MR2130: Fix missing *out=NULL in (WMReader|unknown_inner)_QueryInterface

[Ivan Chikish (＠nekotekina)]

QueryInterface should set *out to NULL on failure, as it seems to do in many different places.

This seems to be a regression from !888.
One old game started to crash on startup with this merge request.
I bisected it and it pointed to the commit 131ada052a2dbec66df695ce536ca048a2bd9174.

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  v4: wmvcore/tests: check out value for NULL in check_interface
 
https://gitlab.winehq.org/wine/wine/-/merge_requests/2130