nvme-auth: use kvfree() for memory allocated with kvcalloc()

nvme-auth: use kvfree() for memory allocated with kvcalloc()

Memory allocated by kvcalloc() may come from vmalloc or kmalloc,
so use kvfree() instead of kfree() for proper deallocation.

Fixes: aa36d711e945 ("nvme-auth: convert dhchap_auth_list to an array")
Signed-off-by: Israel Rukshin <israelr@nvidia.com>
Reviewed-by: Max Gurtovoy <mgurtovoy@nvidia.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Keith Busch <kbusch@kernel.org>