tdf#43157: convert starmath module away from OSL_ASSERT to assert

Change-Id: I446eb5831dd41edac0752d1c4813a7e711042cd3
diff --git a/starmath/source/wordexportbase.cxx b/starmath/source/wordexportbase.cxx
index cf32d06..95418f3 100644
--- a/starmath/source/wordexportbase.cxx
+++ b/starmath/source/wordexportbase.cxx
@@ -161,7 +161,7 @@ void SmWordExportBase::HandleMath(const SmNode* pNode, int nLevel)
    {
    case TDIVIDEBY:
    case TACUTE:
        OSL_ASSERT(false);
        assert(false);
        SAL_FALLTHROUGH; // the above are handled elsewhere, e.g. when handling BINHOR
    default:
        HandleText(pNode, nLevel);