ok millert@

code that assign a u_int value to x_handy.  However, this means
that we need to be careful checking for overflow as we can no longer
subtract a value and check the result for < 0.  We reorder the
expression instead to avoid this problem (basic algebra).
deraadt@ OK

entire trees for testing anyway, I might as well do this intrusive touching
of include files now.  Added openBSD tags.