compilation fix in GetPixelSize() for wxUSE_GRAPHICS_CONTEXT==0

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@46024 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/mac/carbon/font.cpp

@@ -555,7 +555,7 @@ wxSize wxFont::GetPixelSize() const
     dc->GetTextExtent( wxT("g"), &width, &height, NULL, NULL);
     return wxSize((int)width, (int)height);
 #else
-    wxFontBase::GetPixelSize();
+    return wxFontBase::GetPixelSize();
 #endif
 }