In stacktrace(), when aborting a traceback because of nonsensical pc or sp value, don't print a final bogus traceback line.
In stacktrace(), when aborting a traceback because of nonsensical pc or sp
value, don't print a final bogus traceback line.

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