Pull up following revision(s) (requested by tls in ticket #800):
	sys/kern/subr_cprng.c: revision 1.15
Fix a security issue: when we are reseeding a PRNG seeded early in boot
before we had ever had any entropy, if something else has consumed the
entropy that triggered the immediate reseed, we can reseed with as little
as sizeof(int) bytes of entropy.
ticket 800