Report failure of rdiff-backup jobs as such.

ChangeLog

@@ -12,6 +12,8 @@ version 1.0 -- UNRELEASED
 	 . Don't attempt to dump performance_schema database (Redmine#3741).
 	pgsql:
 	 . Don't produce empty uncompressed backups (Redmine#3820).
+	rdiff-backup:
+	 . Use fatal function to report failure of rdiff-backup jobs as such.
 	rysnc:
 	 . Fix numericids option (Redmine#3691).
 	 . Mangle $rsync_options just afterwards (Redmine#3702).

handlers/rdiff.in

@@ -271,8 +271,8 @@ if [ $test = 0 ]; then
       debug $output
       info "Successfully finished backing up source $label"
    else
-      warning $output
-      warning "Failed backup up source $label"
+      error $output
+      fatal "Failed backup up source $label"
    fi
 fi