Drop unused variable

Change-Id: Ie35a1f526d449989cadbbda4bf87e4b96cbcb8ef
Reviewed-on: https://gerrit.libreoffice.org/63012
Tested-by: Jenkins
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>

sw/source/core/txtnode/thints.cxx

@@ -592,7 +592,6 @@ void SwpHints::BuildPortions( SwTextNode& rNode, SwTextAttr& rNewHint,
     const bool bNoLengthAttribute = nThisStart == nThisEnd;
 
     std::vector<SwTextAttr*> aInsDelHints;
-    std::vector<SwTextAttr*>::iterator aIter;
 
     assert( RES_TXTATR_CHARFMT == rNewHint.Which() ||
             RES_TXTATR_AUTOFMT == rNewHint.Which() );