Move rdcap/rdcap16 structs used to get info about disk size off of stack and malloc/free them instead. First stirrings of the tide of de-stacking to come.
Move rdcap/rdcap16 structs used to get info about disk size off of
stack and malloc/free them instead. First stirrings of the tide of
de-stacking to come.

Feedback, fixes and ok matthew@ & tedu@.

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