cppCheck: remove dead assignment

Change-Id: Iea8388c16de3399853dc384e7df6bfcc92170ea2
Signed-off-by: jailletc36 <christophe.jaillet@wanadoo.fr>
Reviewed-on: https://gerrit.libreoffice.org/1018Reviewed-by: Ivan Timofeev <timofeev.i.s@gmail.com>
Tested-by: Ivan Timofeev <timofeev.i.s@gmail.com>

sw/source/core/layout/hffrm.cxx

@@ -74,11 +74,10 @@ static SwTwips lcl_GetFrmMinHeight(const SwLayoutFrm & rFrm)
 
 static SwTwips lcl_CalcContentHeight(SwLayoutFrm & frm)
 {
-    SwFrm* pFrm = frm.Lower();
-
     SwTwips nRemaining = 0;
     sal_uInt16 nNum = 0;
-    pFrm = frm.Lower();
+    SwFrm* pFrm = frm.Lower();
+
     while ( pFrm )
     {
         SwTwips nTmp;