[PATCH] fix /boot/loader for extended slices

[Matthew Dillon]

:This is a revision of the patch I posted a few days ago.  The
:last extended slice never showed when doing an lsdev from the
:loader prompt.

    Ok, I'm going through it now.  I see one little problem right
    off the bat, and that is that you removed dos partition limit
    check (if (od->od_nslices == NEXTDOSPART)), without which the 
    array can overflow, but don't worry about it.  I'll add it back
    in once I figure out how you've reindexed it.

						-Matt