Release all allocated memory if sha type is invalid:
In ccp_run_sha_cmd, if the type of sha is invalid, the allocated
hmac_buf should be released.

v2: fix the goto.
Signed-off-by: Navid Emamdoost <navid.emamdoost@gmail.com>
Acked-by: Gary R Hook <gary.hook@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>