crypto: hash - drop duplicated word in a comment

Drop the doubled word "in" in a comment.
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: linux-crypto@vger.kernel.org
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

include/crypto/hash.h

@@ -687,7 +687,7 @@ static inline void ahash_request_set_crypt(struct ahash_request *req,
  * The message digest API is able to maintain state information for the
  * caller.
  *
- * The synchronous message digest API can store user-related context in in its
+ * The synchronous message digest API can store user-related context in its
  * shash_desc request data structure.
  */