tdf#112689: Replace chained O(U)StringBuffer::append() with operator+

Change-Id: Ieb5c1e13ae647b49fd563f1759d744bd5f008ce1
Reviewed-on: https://gerrit.libreoffice.org/65758
Tested-by: Jenkins
Reviewed-by: Muhammet Kara <muhammet.kara@collabora.com>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
diff --git a/basic/source/comp/exprtree.cxx b/basic/source/comp/exprtree.cxx
index 20d0691..ed7f49e 100644
--- a/basic/source/comp/exprtree.cxx
+++ b/basic/source/comp/exprtree.cxx
@@ -140,9 +140,8 @@
            // generate dummy parameters
            for( sal_Int32 n = 1; n <= pPar->GetSize(); n++ )
            {
                OUStringBuffer aPar("PAR");
                aPar.append(n);
                pProc->GetParams().AddSym( aPar.makeStringAndClear() );
                OUString aPar = "PAR" + OUString::number( n );
                pProc->GetParams().AddSym( aPar );
            }
        }
    }