Fix Coverity Scan CID 300477 (Using uninitialized value err_code.)

openair2/ENB_APP/flexran_agent_handler.c

@@ -420,7 +420,7 @@ int flexran_agent_handle_stats(mid_t mod_id, const void *params, Protocol__Flexr
 int flexran_agent_stats_reply(mid_t enb_id, xid_t xid, const report_config_t *report_config, Protocol__FlexranMessage **msg){
 
   Protocol__FlexHeader *header = NULL;
-  err_code_t err_code;
+  err_code_t err_code = PROTOCOL__FLEXRAN_ERR__UNEXPECTED;
   int i;
 
   if (flexran_create_header(xid, PROTOCOL__FLEX_TYPE__FLPT_STATS_REPLY, &header) != 0)