[Xione/Glass UK][RDKV][VIPA 1.4.4.4][8.4p33s1] Observed "com.comcast.viper" crash with fingerprint- 61111371 contributing to OTTPENDING/BERR#1707
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Adds a lifecycle guard to DrmSession — three new methods (AcquireForUse(), ReleaseAfterUse(), PrepareForDestruction()) using a mutex + condition variable to track in-flight decrypt operations and block deletion until they finish.
Guards every decrypt() call in the GStreamer decryptor plugin (gstcdmidecryptor.cpp) with AcquireForUse() / ReleaseAfterUse(), so the session can't be freed mid-operation.
Calls PrepareForDestruction() before every delete in DrmSessionManager (session clearing, slot reuse/eviction), ensuring any in-flight decrypt drains first .
Minor fix: a sinkCaps reference-counting tweak to avoid accessing freed caps after unlocking the mutex.