random: improve variable naming, clear extract buffer
random: improve variable naming, clear extract buffer

- split the SHA variables apart into hash and workspace
- rename data to extract
- wipe extract and workspace after hashing

Signed-off-by: Matt Mackall <4121265491a72225438dfd0e91a228f361407ae2@selenic.com>
Cc: Theodore Ts'o <4ed386e0495d3e109932df055831d9ec2f824927@mit.edu>
Signed-off-by: Andrew Morton <5c1e68b099950c134891f0b6e179498a8ebe9cf9@linux-foundation.org>
Signed-off-by: Linus Torvalds <69652caca27c8b940640ad396ab71f93cacec34f@linux-foundation.org>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs