coverity#1441443 SwTextFrame always has a SwTextNode

Change-Id: I9453ec9f3021702d89efed0adcf3422a59ae28ae
Reviewed-on: https://gerrit.libreoffice.org/63530
Tested-by: Jenkins
Reviewed-by: Michael Stahl <Michael.Stahl@cib.de>

sw/source/core/text/txtfrm.cxx

@@ -3307,7 +3307,7 @@ void SwTextFrame::CalcAdditionalFirstLineOffset()
     const SwTextNode* pTextNode( GetTextNodeForParaProps() );
     // sw_redlinehide: check that pParaPropsNode is the correct one
     assert(pTextNode->IsNumbered(getRootFrame()) == pTextNode->IsNumbered(nullptr));
-    if (pTextNode && pTextNode->IsNumbered(getRootFrame()) &&
+    if (pTextNode->IsNumbered(getRootFrame()) &&
         pTextNode->IsCountedInList() && pTextNode->GetNumRule())
     {
         int nListLevel = pTextNode->GetActualListLevel();