Bug fix. Invalid HANDLE must not has nullptr, but INVALID_HANDLE_VALUE.
Created attachment 342309 [details] PATCH
Comment on attachment 342309 [details] PATCH R=me.
Comment on attachment 342309 [details] PATCH Clearing flags on attachment: 342309 Committed r232639: <https://trac.webkit.org/changeset/232639>
All reviewed patches have been landed. Closing bug.
<rdar://problem/40950238>