[Bug stdio/33998] libio: ungetwc could be used to leak data on special conditions

[marocketbd at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=33998

--- Comment #1 from Rocket Ma <marocketbd at gmail dot com> ---
Created attachment 16664
  --> https://sourceware.org/bugzilla/attachment.cgi?id=16664&action=edit
suggested fix (for bug 33998 and 33999)

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