silence exit code message unless --debug is used

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+### Fixed
+
+- [core] silence exit code message unless --debug is used
+
 ## [1.2.0] - 2021-01-21
 
 ### Fixed

src/backupninja.in

@@ -376,8 +376,8 @@ function process_action() {
             done
          )
          retcode=${PIPESTATUS[0]}
-         debug "handler returned exit code $retcode"
          echo_debug_msg=0
+         debug "handler returned exit code $retcode"
 
       else
          # a backup is probably ongoing already, so display an error message