staging: ccree: Uninitialized return in ssi_ahash_import()

The return value isn't initialized on some success paths.

Fixes: c5f39d07 ("staging: ccree: fix leak of import() after init()")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>