This branch was added in dd00dab5e9e8650f3f00660c2e611f81f1e8cd5b but is
never actually taken, as it requires `cc_data` to be null but
`cc_data_len` to be non-null. It would then dereference the null
`cc_data`.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/7967>