[SX126x] Fixed warnings

src/modules/SX126x/SX126x.cpp

@@ -1216,13 +1216,13 @@ uint8_t SX126x::random() {
 void SX126x::setDirectAction(void (*func)(void)) {
   // SX126x is unable to perform direct mode reception
   // this method is implemented only for PhysicalLayer compatibility
-  return(0);
+  (void)func;
 }
 
 void SX126x::readBit(RADIOLIB_PIN_TYPE pin) {
   // SX126x is unable to perform direct mode reception
   // this method is implemented only for PhysicalLayer compatibility
-  return(0);
+  (void)pin;
 }
 
 int16_t SX126x::setTCXO(float voltage, uint32_t delay) {