under some circunstances, unp_scan() can call unp_mark() with a null pointer, so check fp before dereferencing it; fixes a crash found by hshoexer@ with input from art@, art@ millert@ deraadt@ ok.
under some circunstances, unp_scan() can call unp_mark() with a null pointer,
so check fp before dereferencing it; fixes a crash found by hshoexer@
with input from art@, art@ millert@ deraadt@ ok.

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