AP_Arming: logger: fail check if downloading logs

libraries/AP_Arming/AP_Arming.cpp

@@ -260,6 +260,10 @@ bool AP_Arming::logging_checks(bool report)
             check_failed(ARMING_CHECK_LOGGING, report, "No SD card");
             return false;
         }
+        if (AP::logger().in_log_download()) {
+            check_failed(ARMING_CHECK_LOGGING, report, "Downloading logs");
+            return false;
+        }
     }
     return true;
 }