This was broken in b29262e662b86cd76225894f7504ee505125fa49.
The `gst_util_uint64_scale` emitted a critical warning and returned
`GST_CLOCK_TIME_NONE`, so beyond removing the warning this fix does not
change behavior.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/9415>