cem 6f68fd4705 random(4): Correct a bare zero to the appropriate enum
The convention for updating hc_destination[] is to index with a
random_entropy_source.  Zero happens to match RANDOM_CACHED, which is
correct for this source (early random data).  Spell the zero value as the
enum name instead of the magic constant.

No functional change.

Reviewed by:	delphij, markm
Approved by:	secteam (delphij)
Sponsored by:	Dell EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D16983
2018-10-20 21:06:15 +00:00
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