crypto: api - Remove completion function scaffolding

This patch removes the temporary scaffolding now that the comletion
function signature has been converted.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Author: herbertx

include/linux/crypto.h

@@ -176,7 +176,6 @@ struct crypto_async_request;
 struct crypto_tfm;
 struct crypto_type;
 
-typedef void crypto_completion_data_t;
 typedef void (*crypto_completion_t)(void *req, int err);
 
 /**
@@ -596,11 +595,6 @@ struct crypto_wait {
 /*
  * Async ops completion helper functioons
  */
-static inline void *crypto_get_completion_data(void *data)
-{
-	return data;
-}
-
 void crypto_req_done(void *req, int err);
 
 static inline int crypto_wait_req(int err, struct crypto_wait *wait)