octeon_ep: unlock the correct lock on error path

The h and the f letters are swapped so it unlocks the wrong lock.

Fixes: 577f0d1b ("octeon_ep: add separate mailbox command and response queues")
Signed-off-by: Dan Carpenter <error27@gmail.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Link: https://lore.kernel.org/r/251aa2a2-913e-4868-aac9-0a90fc3eeeda@kili.mountain


Signed-off-by: Jakub Kicinski <kuba@kernel.org>