ELM327 safety mode: re use existing functions

board/safety/safety_elm327.h

@@ -1,5 +1,3 @@
-static void elm327_rx_hook(CAN_FIFOMailBox_TypeDef *to_push) {}
-
 static int elm327_tx_hook(CAN_FIFOMailBox_TypeDef *to_send) {
   //All ELM traffic must appear on CAN0
   if(((to_send->RDTR >> 4) & 0xf) != 0) return 0;
@@ -27,20 +25,12 @@ static int elm327_tx_lin_hook(int lin_num, uint8_t *data, int len) {
   return true;
 }
 
-static void elm327_init(int16_t param) {
-  controls_allowed = 1;
-}
-
-static int elm327_fwd_hook(int bus_num, CAN_FIFOMailBox_TypeDef *to_fwd) {
-  return -1;
-}
-
 const safety_hooks elm327_hooks = {
-  .init = elm327_init,
-  .rx = elm327_rx_hook,
+  .init = nooutput_init,
+  .rx = default_rx_hook,
   .tx = elm327_tx_hook,
   .tx_lin = elm327_tx_lin_hook,
   .ignition = default_ign_hook,
-  .fwd = elm327_fwd_hook,
+  .fwd = nooutput_fwd_hook,
   .relay = nooutput_relay_hook,
 };