Fixed minor compile error

apps/sensors/sensors.cpp

@@ -641,7 +641,7 @@ Sensors::adc_init()
 	_fd_adc = open("/dev/adc0", O_RDONLY | O_NONBLOCK);
 	if (_fd_adc < 0) {
 		warnx("/dev/adc0");
-		warnx(1, "FATAL: no ADC found");
+		warnx("FATAL: no ADC found");
 	}
 }