Fix: Must return explicit zero to prevent script exit

Signed-off-by: Knut Ahlers <knut@ahlers.me>

bin/docker-credential-vault

@@ -50,7 +50,7 @@ function hash_hostname() {
 }
 
 function log() {
-  [ $NO_LOG -eq 0 ] || return
+  [ $NO_LOG -eq 0 ] || return 0
   echo "[$(date +%H:%M:%S)][docker-credential-vault] $@" >&2
 }