[PATCH] KEYS: trusted: Avoid calling null function trusted_key_exit

[Jarkko Sakkinen]

On Wed, Jan 26, 2022 at 12:41:55PM -0600, Dave Kleikamp wrote:
> If one loads and unloads the trusted module, trusted_key_exit can be
> NULL. Call it through static_call_cond() to avoid a kernel trap.
> 
> Fixes: 5d0682be3189 ("KEYS: trusted: Add generic trusted keys framework")
> 
> Signed-off-by: Dave Kleikamp <dave.kleikamp at oracle.com>

Please re-send with cc stable and the empty line removed and I'll pick it.

BR, Jarkko