fix the panic reported in pr/5602 by correctly unmaping the space on error. disestablish the interrupt on error as well. krw@ comments and ok tested by reporter via mikeb@
fix the panic reported in pr/5602 by correctly unmaping the space on error.
disestablish the interrupt on error as well. krw@ comments and ok
tested by reporter via mikeb@

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars