I missed a ::write, stupid jenkins

src/drivers/distance_sensor/pga460/pga460.cpp

@@ -665,11 +665,17 @@ int PGA460::read_threshold_registers()
 	}
 }
 
-void PGA460::request_results()
+int PGA460::request_results()
 {
 	uint8_t buf_tx[2] = {SYNCBYTE, UMR};
-	::write(_fd, &buf_tx[0], sizeof(buf_tx));
+	int ret = ::write(_fd, &buf_tx[0], sizeof(buf_tx));
 	usleep(10000);
+
+	if(ret < 0) {
+		return PX4_ERROR;
+	}
+
+	return PX4_OK;
 }
 
 void PGA460::run()

src/drivers/distance_sensor/pga460/pga460.h

@@ -354,7 +354,7 @@ private:
 	/**
 	 * @brief Measurement is read from UART RX buffer and published to the uORB distance sensor topic.
 	 */
-	void request_results();
+	int request_results();
 
 	/**
 	 * @brief Checks the measurement from last report and sets the range distance mode (long range , short range).