[Bug 773546] leak in ensure_profiles (double free or corruption)

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=773546

Hyunjun Ko <zzoon at igalia.com> changed:

           What    |Removed                     |Added
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                 CC|                            |zzoon at igalia.com

--- Comment #21 from Hyunjun Ko <zzoon at igalia.com> ---
Created attachment 339305
  --> https://bugzilla.gnome.org/attachment.cgi?id=339305&action=edit
display: take display lock during ensuring profiles/formats

Since vaapi plugins are sharing VaapiDisplay, should be careful to handle
variables, which could be accessed by others.

This patch fixes crash, which can happen when using multiple vaapi
encoder/decoder in one pipeline.

@Florent, could you test with this patch?
I confirmed it's ok on my laptop, but need more test.

@Victor, does this patch make sense? I'm wondering because of a bit performance
degradation.

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