Add data from zero-entropy random_writes directly to output pools to
avoid accounting difficulties on machines without entropy sources.

Tested on lguest with all entropy sources disabled.
Signed-off-by: NMatt Mackall <mpm@selenic.com>
Acked-by: N"Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>