Fix the remaning clang thread safety warnings in WTF::DataMutex. The goal of this patch is to reduce the number of warnings in the GStreamer codebase. Whether DataMutex should be deprecated in favor of Locker with the clang TSA annotations is outside of the scope of this patch.
Created attachment 430731 [details] Patch
Committed r278558 (238556@main): <https://commits.webkit.org/238556@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 430731 [details].