Log the length of the window label if creating it fails in wxMSW

This can be useful in case of unexpected window creation failure, so log
it because it doesn't cost much for something that is supposed to
practically never happen anyhow.

src/msw/window.cpp

@@ -4049,8 +4049,8 @@ WXHWND wxWindowMSW::MSWCreateWindowAtAnyPosition(WXDWORD exStyle, const wxChar*
     {
         wxLogLastError(wxString::Format
         (
-            wxT("CreateWindowEx(\"%s\", flags=%08lx, ex=%08lx)"),
-            clName, style, exStyle
+            wxT("CreateWindowEx(\"%s\", flags=%08lx, ex=%08lx, title-len=%zu)"),
+            clName, style, exStyle, title ? wxStrlen(title) : 0
         ));
     }
     else if ( !IsTopLevel() && !MSWIsPositionDirectlySupported(x, y) )