Backport of "libs: dec: vp9: clear parser pointer after release" into 1.16
requested to merge tpm/gstreamer-vaapi:backport-mr-101-into-1.16-vp9-fix-use-after-release into 1.16
Backport of !101 (merged) "libs: dec: vp9: clear parser pointer after release".
Commits:
- e62b321e libs: dec: vp9: clear parser pointer after release