rm local var

GUI/coregui/utils/ImportDataInfo.cpp

@@ -99,9 +99,7 @@ QString ImportDataInfo::axisLabel(size_t axis_index) const
     else if (rank == 1) {
         if (axis_index > 0)
             return "Signal [a.u.]";
-
-        auto label_map = AxisNames::specAxis;
-        return QString::fromStdString(label_map[m_units]);
+        return QString::fromStdString(AxisNames::specAxis.at(m_units));
     }
     throw GUIHelpers::Error("Error in ImportDataInfo::axisLabel: unsupported data type");
 }