remove assert from PurgeOtherRepresentations,we'll have to trust that callers know what they're doing

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@42073 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/bitmap.cpp

@@ -997,9 +997,6 @@ void wxBitmap::SetPixbuf(GdkPixbuf* pixbuf, int depth)
 
 void wxBitmap::PurgeOtherRepresentations(wxBitmap::Representation keep)
 {
-    // AllocExclusive should not be needed for this internal function
-    wxASSERT(m_refData->GetRefCount() == 1);
-
     if (keep == Pixmap && HasPixbuf())
     {
         g_object_unref (M_BMPDATA->m_pixbuf);