crypto: skcipher - Don't use __crypto_dequeue_request()

Use skcipher_givcrypt_cast(crypto_dequeue_request(queue)) instead, which
does the same thing in much cleaner way. The skcipher_givcrypt_cast()
actually uses container_of() instead of messing around with offsetof()
too.
Signed-off-by: Marek Vasut <marex@denx.de>
Reported-by: Arnd Bergmann <arnd@arndb.de>
Cc: Pantelis Antoniou <panto@antoniou-consulting.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

include/crypto/internal/skcipher.h

@@ -81,8 +81,7 @@ static inline int skcipher_enqueue_givcrypt(
 static inline struct skcipher_givcrypt_request *skcipher_dequeue_givcrypt(
 	struct crypto_queue *queue)
 {
-	return __crypto_dequeue_request(
-		queue, offsetof(struct skcipher_givcrypt_request, creq.base));
+	return skcipher_givcrypt_cast(crypto_dequeue_request(queue));
 }
 
 static inline void *skcipher_givcrypt_reqctx(