kzfree() v2

This series introduces kzfree() and converts callsites which do memset() + kzfree() explicitely.

The caller intention is to ensure that security-sensitive data are cleared from slab objects before they are passed back to the allocator.

This also removes the last modular ksize() user (crypto/api.c) again by converting it to kzfree() which figures out the length of the memory region to zero internally.

I left out drivers/w1/w1{,_int}.c and dropped the conversion of drivers/atm/mpoa_caches.c in this iteration as I think they don't strictly need the zeroeing and the memsetting should probably be removed [ added Chas Williams and Evgeniy Polyakov to Cc ].

v2:
- EXPORT_SYMBOL(kzfree), thanks linker
- remove superfluous NULL checks, thanks Pekka
- mention `security' in the description

Hannes

 arch/s390/crypto/prng.c             |    3 +--
 crypto/api.c                        |    5 +----
 drivers/md/dm-crypt.c               |    6 ++----
 drivers/s390/crypto/zcrypt_pcixcc.c |    3 +--
 drivers/usb/host/hwa-hc.c           |    3 +--
 drivers/usb/wusbcore/cbaf.c         |    3 +--
 fs/cifs/connect.c                   |    6 +-----
 fs/cifs/misc.c                      |   10 ++--------
 fs/ecryptfs/keystore.c              |    3 +--
 fs/ecryptfs/messaging.c             |    3 +--
 include/linux/slab.h                |    1 +
 mm/util.c                           |   20 ++++++++++++++++++++
 12 files changed, 33 insertions(+), 33 deletions(-)

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