tdf#163486: PVS: Expression is always false

V547 	Expression 'pDocShell == nullptr' is always false.

Change-Id: I0f79864cb5fbfe209cb0c2441665027355aced3d
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/175463
Tested-by: Jenkins
Reviewed-by: Xisco Fauli <xiscofauli@libreoffice.org>

starmath/source/mathml/export.cxx

@@ -90,11 +90,6 @@ bool SmMLExportWrapper::Export(SfxMedium& rMedium)
 
     // Medium item set
     SfxItemSet& rMediumItemSet = rMedium.GetItemSet();
-    if (pDocShell == nullptr)
-    {
-        SAL_WARN("starmath", "Failed to get medium item set");
-        return false;
-    }
 
     // Progress bar ~
     uno::Reference<task::XStatusIndicator> xStatusIndicator;