update postinst

DEBIAN/postinst

@@ -9,7 +9,7 @@ CONFIG=/etc/sssd/sssd.conf
 
 if [ ! -f "$CONFIG" ]; then
     echo "Error: Configuration file $CONFIG does not exist."
-    exit 10
+    exit 9
 fi
 
 sed -i "s/ldap_default_authtok =.*/ldap_default_authtok = $RET/" $CONFIG