Fixed rare race condition with location event

Author: jkasten2

OneSignalSDK/onesignal/src/main/java/com/onesignal/LocationGMS.java

@@ -204,7 +204,7 @@ static void fireFailedComplete() {
          mGoogleApiClient.disconnect();
    }
 
-   private static void fireComplete(LocationPoint point) {
+   private synchronized static void fireComplete(LocationPoint point) {
       locationHandler.complete(point);
       if (fallbackFailThread != null && !Thread.currentThread().equals(fallbackFailThread))
          fallbackFailThread.interrupt();