Exit unsuccessfully in usage()

The command must not have completed successfully if usage() was called,
so indicate this to the user as well.

1 files changed, 1 insertions, 1 deletions

diff --git a/lifeboat b/lifeboat
index f368433..d0a979c 100755
--- a/lifeboat
+++ b/lifeboat
@@ -15,7 +15,7 @@ errx() {
 
 usage() {
 	printf "usage: lifeboat repo [run|restic-cmd]\n"
-	exit 0
+	exit 1
 }
 
 run_backup() {