Remove null occurrences of reinterpret_cast which just converted HDC to HDC.
Remove null occurrences of reinterpret_cast which just converted HDC to HDC.

rhaberkorn/scintilla-mirror,rhaberkorn/scintilla-mirror,rhaberkorn/scintilla-mirror,rhaberkorn/scintilla-mirror,rhaberkorn/scintilla-mirror,rhaberkorn/scintilla-mirror,rhaberkorn/scintilla-mirror,rhaberkorn/scintilla-mirror