Clean up C-style casts from pointers to void

Change-Id: Ic903d2429672159691fef58d0d7a15433c884250

canvas/source/cairo/cairo_canvashelper.cxx

@@ -441,7 +441,7 @@ namespace cairocanvas
                 if( aBmpEx.IsTransparent() || aBmpEx.IsAlpha() )
                     pAlphaReadAcc = aAlpha.AcquireReadAccess();
 
-                data = (unsigned char*) malloc( nWidth*nHeight*4 );
+                data = static_cast<unsigned char*>(malloc( nWidth*nHeight*4 ));
 
                 long nOff = 0;
                 ::Color aColor;

canvas/source/cairo/cairo_textlayout.cxx

@@ -520,7 +520,7 @@ namespace cairocanvas
             font_face = cairo_win32_font_face_create_for_hfont(rSysFontData.hFont);
 
 #elif defined CAIRO_HAS_FT_FONT
-            font_face = cairo_ft_font_face_create_for_ft_face((FT_Face)rSysFontData.nFontId,
+            font_face = cairo_ft_font_face_create_for_ft_face(static_cast<FT_Face>(rSysFontData.nFontId),
                                                               rSysFontData.nFontFlags);
 #else
 # error Native API needed.