fix dereferencing problem of structure eNB_MAC_INST_NB_IoT_s

openair2/LAYER2/MAC/defs_NB_IoT.h

@@ -526,7 +526,12 @@ typedef struct{
 
 
 /*! \brief top level eNB MAC structure */
-typedef struct mac_NB_IoT_s{
+typedef struct eNB_MAC_INST_NB_IoT_s{
+
+  /// Ethernet parameters for northbound midhaul interface
+  eth_params_t         eth_params_n;
+  /// Ethernet parameters for fronthaul interface
+  eth_params_t         eth_params_s;
 
     uint8_t Mod_id;