Backport of "msdk: check GstMsdkContext instead of mfxSession instance" into 1.18
Backport of !1867 (merged) "msdk: check GstMsdkContext instead of mfxSession instance".
Commits:
- 86fdd391 msdk: check GstMsdkContext instead of mfxSession instance
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Backport of !1867 (merged) "msdk: check GstMsdkContext instead of mfxSession instance".
Commits: