Fix wxFont::GetFaceName() for not realized yet fonts in wxMSW.

GetFaceName() could be called for a font that hadn't been really used yet and
hence its wxFontRefData::m_hFont could be 0 and couldn't be used in
GetMSWFaceName().

Fix this by using GetHFONT() accessor instead of m_hFont directly to create
the font if necessary.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@69106 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/font.cpp

@@ -279,7 +279,7 @@ protected:
     wxString GetMSWFaceName() const
     {
         ScreenHDC hdc;
-        SelectInHDC selectFont(hdc, m_hFont);
+        SelectInHDC selectFont(hdc, (HFONT)GetHFONT());
 
         UINT otmSize = GetOutlineTextMetrics(hdc, 0, NULL);
         if ( !otmSize )