Key blobs for the IOCTLs PKEY_KBLOB2PROTK[23] may contain clear key
material. Zeroize the copies of these keys in kernel memory after
creating the protected key.
Reviewed-by: NHarald Freudenberger <freude@linux.ibm.com>
Signed-off-by: NHolger Dengler <dengler@linux.ibm.com>
Signed-off-by: NAlexander Gordeev <agordeev@linux.ibm.com>