unset BACKUPNINJA_DEBUG before exit

CHANGELOG.md

@@ -14,6 +14,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Changed
 
 - [core] raise error if mail isn't found in $PATH and reportemail = yes
+- [core] unset BACKUPNINJA_DEBUG before exit
 
 ### Fixed
 

src/backupninja.in

@@ -672,6 +672,9 @@ if [ -n "$reporthost" ]; then
    fi
 fi
 
+# unset exported envvars
+unset BACKUPNINJA_DEBUG
+
 # return exit code
 [ $halts == 0 ] || exit 2
 [ $fatals == 0 ] || exit 2