LandDetector: make type passed to param_get() explicit

src/modules/land_detector/LandDetector.cpp

@@ -169,9 +169,9 @@ void LandDetector::_check_params(const bool force)
 	if (updated || force) {
 		_update_params();
 		uint32_t flight_time;
-		param_get(_p_total_flight_time_high, &flight_time);
+		param_get(_p_total_flight_time_high, (int32_t *)&flight_time);
 		_total_flight_time = ((uint64_t)flight_time) << 32;
-		param_get(_p_total_flight_time_low, &flight_time);
+		param_get(_p_total_flight_time_low, (int32_t *)&flight_time);
 		_total_flight_time |= flight_time;
 	}
 }