patch: remove KASSERT()'s from g_load_class()

[Andrew R. Reiter]

I will be committing this in a bit as I am waiting on write access to the
repo.  But for now the patch may be found at:

	http://people.freebsd.org/~arr/geom_class_loaded.diff

This fixes a panic that occurs when trying to kldload a GEOM module that
was already loaded.  Instead of panic'ing, it will return a warning.

Cheers,
Andrew

--
Andrew R. Reiter
arr at watson.org
arr at FreeBSD.org