warning fixes for BCC and OW (heavily modified patch 819146)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@24196 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/gdiimage.cpp

@@ -372,7 +372,8 @@ bool wxBMPFileHandler::LoadFile(wxBitmap *bitmap,
 
     wxDIB dib(name);
 
-    return dib.IsOk() && bitmap->CopyFromDIB(dib);
+    bool ok = dib.IsOk() && bitmap->CopyFromDIB(dib);
+    return ok;
 #else
   WXHBITMAP hBitmap = (WXHBITMAP)wxLoadBMP(name);
   if(hBitmap) {