crypto: qat - remove unused and redundant pointer vf_info

The pointer vf_info is being assigned but never read, it is redundant
and therefore can be removed.

Cleans up clang warning: Value stored to 'vf_info' is never read

Fixes: ed8ccaef

 ("crypto: qat - Add support for SRIOV")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>