AP_GPS: fixed printf format errors

libraries/AP_GPS/AP_GPS_NMEA.cpp

@@ -246,8 +246,8 @@ bool AP_GPS_NMEA::_have_new_message()
     if (labs(dt_ms - gps._rate_ms[state.instance]) > 50 &&
         get_type() == AP_GPS::GPS_TYPE_ALLYSTAR) {
         nmea_printf(port, "$PHD,06,42,UUUUTTTT,BB,0,%u,55,0,%u,0,0,0",
-                    1000U/gps._rate_ms[state.instance],
-                    gps._rate_ms[state.instance]);
+                    unsigned(1000U/gps._rate_ms[state.instance]),
+                    unsigned(gps._rate_ms[state.instance]));
     }
 
     _last_fix_ms = now;

libraries/AP_GPS/GPS_Backend.cpp

@@ -141,7 +141,7 @@ void AP_GPS_Backend::_detection_message(char *buffer, const uint8_t buflen) cons
                  "GPS %d: detected as %s at %d baud",
                  instance + 1,
                  name(),
-                 gps._baudrates[dstate.current_baud]);
+                 int(gps._baudrates[dstate.current_baud]));
     } else {
         hal.util->snprintf(buffer, buflen,
                  "GPS %d: specified as %s",