Stop annoying errors when there is no serial device.

libs/qtandroidserialport/src/qserialportinfo_android.cpp

@@ -50,6 +50,8 @@ static const char V_TAG[] {"QGC_QSerialPortInfo"};
 
 extern void cleanJavaException();
 
+static int gErrorCount = 0;
+
 QList<QSerialPortInfo> availablePortsByFiltersOfDevices(bool &ok)
 {
     QList<QSerialPortInfo> serialPortInfoList;
@@ -61,9 +63,15 @@ QList<QSerialPortInfo> availablePortsByFiltersOfDevices(bool &ok)
         "()[Ljava/lang/String;");
     
     if (!resultL.isValid()) {
-        __android_log_print(ANDROID_LOG_ERROR, V_TAG, "Error from availableDevicesInfo");
+        //-- If 5 consecutive errors, ignore it.
+        if(gErrorCount < 5) {
+            gErrorCount++;
+            __android_log_print(ANDROID_LOG_ERROR, V_TAG, "Error from availableDevicesInfo");
+        }
         ok = false;
         return serialPortInfoList;
+    } else {
+        gErrorCount = 0;
     }
 
     QAndroidJniEnvironment envL;