fix some asserts that were clearly meant to be wxFAIL_MSG

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@76272 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/richtext/richtextbuffer.cpp

@@ -311,7 +311,7 @@ int wxRichTextFloatCollector::GetFitPosition(int direction, int start, int heigh
         return GetFitPosition(m_right, start, height);
     else
     {
-        wxASSERT("Never should be here");
+        wxFAIL_MSG("Never should be here");
         return start;
     }
 }
@@ -341,7 +341,7 @@ void wxRichTextFloatCollector::CollectFloat(wxRichTextParagraph* para, wxRichTex
             break;
         default:
             delete map;
-            wxASSERT("Unrecognised float attribute.");
+            wxFAIL_MSG("Unrecognised float attribute.");
     }
 
     m_para = para;