v4l2src: fix spurious SOURCE_CHANGED error-level log messages
Merged
requested to merge tpm/gst-plugins-good:v4l2src-spurious-source-changed-error-log into master
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The migration is almost done, at least the rest should happen in the background. There are still a few technical difference between the old cluster and the new ones, and they are summarized in this issue. Please pay attention to the TL:DR at the end of the comment.
They're harmless, and some drivers at least return EINVAL instead of ENOTTY for unsupported events (here: uvcvideo).