Avoid index for single getToken call

Change-Id: Id7206487f96792ffe38611c36ac0e0e28bcc59b7
Reviewed-on: https://gerrit.libreoffice.org/66222
Tested-by: Jenkins
Reviewed-by: Matteo Casalin <matteo.casalin@yahoo.com>

xmloff/source/text/txtparai.cxx

@@ -1874,10 +1874,7 @@ XMLParaContext::XMLParaContext(
     if( !aCondStyleName.isEmpty() )
         sStyleName = aCondStyleName;
     else if( !sClassNames.isEmpty() )
-    {
-        sal_Int32 nDummy = 0;
-        sStyleName = sClassNames.getToken( 0, ' ', nDummy );
-    }
+        sStyleName = sClassNames.getToken( 0, ' ' );
 }
 
 void XMLParaContext::EndElement()