when cleanup is called without code exit with 0

Signed-off-by: BlackEagle <ike.devolder@gmail.com>
Signed-off-by: Pierre Schmitz <pierre@archlinux.de>

lib/common.sh

@@ -65,7 +65,7 @@ setup_workdir() {
 
 cleanup() {
 	[[ -n $WORKDIR ]] && rm -rf "$WORKDIR"
-	[[ $1 ]] && exit $1
+	exit ${1:-0}
 }
 
 abort() {