KF: warning fixes

algo/kf/core/geo/KfFieldRegion.h

@@ -234,8 +234,8 @@ namespace cbm::algo::kf
       std::string ToString(int indentLevel = 0, int verbose = 1) const;
 
      protected:
-      CoeffArray_t fCoeff{{T(0.)}};  ///< Approximation coefficients
-      T fZfirst{Literal_t<T>()};     ///< Reference z-coordinate of the field region
+      CoeffArray_t fCoeff{};      ///< Approximation coefficients
+      T fZfirst{Literal_t<T>()};  ///< Reference z-coordinate of the field region
 
      private:
       /// Serialization function