fix #397 from @a-f-G-U-C - bogus GPS positions during locking could be reported

btw - from my read of the NMEA, the lowest value that means 'has a valid
position' is 1 not 2.  But I only know this because you pointed me at
it ;-)

Thanks!

src/gps/NEMAGPS.cpp

@@ -44,6 +44,9 @@ void NEMAGPS::loop()
             isConnected = true; // we seem to have a real GPS (but not necessarily a lock)
         }
 
+        uint8_t fixtype = reader.fixQuality();
+        hasValidLocation = ((fixtype >= 1) && (fixtype <= 5));
+
         if (reader.location.isUpdated()) {
             if (reader.altitude.isValid())
                 altitude = reader.altitude.meters();
@@ -58,18 +61,21 @@ void NEMAGPS::loop()
                 dop = reader.hdop.value();
             }
             if (reader.course.isValid()) {
-                heading = reader.course.value() * 1e3;  //Scale the heading (in degrees * 10^-2) to match the expected degrees * 10^-5
+                heading =
+                    reader.course.value() * 1e3; // Scale the heading (in degrees * 10^-2) to match the expected degrees * 10^-5
             }
             if (reader.satellites.isValid()) {
                 numSatellites = reader.satellites.value();
             }
 
             // expect gps pos lat=37.520825, lon=-122.309162, alt=158
-            DEBUG_MSG("new NEMA GPS pos lat=%f, lon=%f, alt=%d, hdop=%f, heading=%f\n", latitude * 1e-7, longitude * 1e-7, altitude, dop * 1e-2, heading * 1e-5);
+            DEBUG_MSG("new NEMA GPS pos lat=%f, lon=%f, alt=%d, hdop=%f, heading=%f\n", latitude * 1e-7, longitude * 1e-7,
+                      altitude, dop * 1e-2, heading * 1e-5);
         }
 
         // Notify any status instances that are observing us
-        const meshtastic::GPSStatus status = meshtastic::GPSStatus(hasLock(), isConnected, latitude, longitude, altitude, dop, heading, numSatellites);
+        const meshtastic::GPSStatus status =
+            meshtastic::GPSStatus(hasLock(), isConnected, latitude, longitude, altitude, dop, heading, numSatellites);
         newStatus.notifyObservers(&status);
     }
 }

src/mesh/MeshService.cpp

@@ -299,8 +299,8 @@ int MeshService::onGPSChanged(const meshtastic::GPSStatus *unused)
     p->decoded.which_payload = SubPacket_position_tag;
 
     Position &pos = p->decoded.position;
-    // !zero or !zero lat/long means valid
-    if (gps->latitude != 0 || gps->longitude != 0) {
+
+    if (gps->hasLock()) {
         if (gps->altitude != 0)
             pos.altitude = gps->altitude;
         pos.latitude_i = gps->latitude;