cppcheck: knownConditionTrueFalse 'bRet' is always false

regression of commit 528632660b72b105345945c13c5b68060d94a91b
Date:   Thu Feb 9 08:52:13 2017 +0200
    convert ErrCode to strong typedef

Change-Id: I5ce2b7d38c8d71ec40cc8de7c13e8aec637476b7
Reviewed-on: https://gerrit.libreoffice.org/42139
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
diff --git a/reportdesign/source/filter/xml/xmlfilter.cxx b/reportdesign/source/filter/xml/xmlfilter.cxx
index 0398bb5..2195935 100644
--- a/reportdesign/source/filter/xml/xmlfilter.cxx
+++ b/reportdesign/source/filter/xml/xmlfilter.cxx
@@ -559,8 +559,7 @@ bool ORptFilter::implImport( const Sequence< PropertyValue >& rDescriptor )
        }


        bRet = false;
        nRet = ERRCODE_NONE;
        bRet = nRet == ERRCODE_NONE;

        if ( bRet )
        {