crypto: sahara - checking the wrong variable

There is a typo here.  "dev->hw_link[]" is an array, not a pointer, so
the check is nonsense.  We should be checking recently allocated
"dev->hw_link[0]" instead.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>