The unit test will use WX_ASSERT_FAILS_WITH_ASSERT to check DoSetRegion(test/geometry/region.cpp:101) eventually, and the macro could handle exception, not true or false. Change it consistent with other port

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77783 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/x11/region.cpp

@@ -289,8 +289,7 @@ bool wxRegion::DoGetBox( wxCoord &x, wxCoord &y, wxCoord &w, wxCoord &h ) const
 
 bool wxRegion::DoOffset( wxCoord x, wxCoord y )
 {
-    if (!m_refData)
-        return false;
+    wxCHECK_MSG( m_refData, false, wxS("invalid region") );
 
     AllocExclusive();