crypto: shash - don't exclude async statuses from error stats

EINPROGRESS and EBUSY have special meaning for async operations.
However, shash is always synchronous, so these statuses have no special
meaning for shash and don't need to be excluded when handling errors.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>