coverity#1212509 Logically dead code

this look very wrong, surely this is what was meant

Change-Id: I461fc1a67770c733aee2f4379dcc252abd09b641
diff --git a/sw/source/core/unocore/unochart.cxx b/sw/source/core/unocore/unochart.cxx
index 1dea221..d688d9f 100644
--- a/sw/source/core/unocore/unochart.cxx
+++ b/sw/source/core/unocore/unochart.cxx
@@ -797,9 +797,9 @@ uno::Reference< chart2::data::XDataSource > SwChartDataProvider::Impl_createData
            {
                sal_Int32 nFirstSeqLen = 0;
                sal_Int32 nFirstSeqLabelIdx = -1;
                bool bFirstFound = false;
                for (oi = 0;  oi < oiEnd;  ++oi)
                {
                    bool bFirstFound = false;
                    // row/col used at all?
                    if (aDataStartIdx[oi] != -1 &&
                        (!bFirstIsLabel || aLabelIdx[oi] != -1))