keep this in sync a bit with userland by putting static on functions that are only used in this file.
keep this in sync a bit with userland by putting static on functions
that are only used in this file.

tedu argues if something sucks we would fault before we can get to
these, and they dont do anything except maths. these symbols dont
need to be visible to ddb.

originally from Fritjof Bornebusch
suggested by and ok tedu@

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