KEYS: Add an RCU payload dereference macro
Add an RCU payload dereference macro as this seems to be a common piece of code amongst key types that use RCU referenced payloads. Signed-off-by: NDavid Howells <dhowells@redhat.com> Signed-off-by: NMimi Zohar <zohar@us.ibm.com> Signed-off-by: NJames Morris <jmorris@namei.org>
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