Backport of "v4l2: silence valgrind warning" into 1.24
requested to merge gstreamer-backport-bot/gstreamer:mr-6144-backport-into-1.24-feature-ioctl-fix into 1.24
Backport of !6144 (merged) "v4l2: silence valgrind warning".
Commits:
- 343e31dc v4l2: silence valgrind warning