npapi win32: fixed crash on close with active fullscreen mode.
npapi win32: fixed crash on close with active fullscreen mode.

jamesbates/npapi-vlc,jamesbates/npapi-vlc,chengsun/gtk-npapi-vlc,jamesbates/npapi-vlc,chengsun/gtk-npapi-vlc,chengsun/gtk-npapi-vlc