BUG: wrong condition for field creation

Applications/Segmentation/otbSegmentation.cxx

@@ -495,7 +495,8 @@ private:
         // And create the field if necessary
         std::string fieldName = this->GetParameterString("mode.vector.fieldname");
         OGRFeatureDefn & ogrFeatureDfn = layer.GetLayerDefn();
-        if (-1 != ogrFeatureDfn.GetFieldIndex(fieldName.c_str()))
+
+        if (-1 == ogrFeatureDfn.GetFieldIndex(fieldName.c_str()))
           {
           OGRFieldDefn field(fieldName.c_str(),OFTInteger);
           layer.CreateField(field,true);