crypto: Redundant type conversion for AES_KEY pointer

We can delete the redundant type conversion if
we set the the AES_KEY parameter with 'const' in
qcrypto_cipher_aes_ecb_(en|de)crypt() function.

Reported-by: Euler Robot <euler.robot@huawei.com>
Signed-off-by: Chen Qun <kuhn.chenqun@huawei.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>

crypto/cipher-builtin.c

@@ -74,7 +74,7 @@ static void qcrypto_cipher_free_aes(QCryptoCipher *cipher)
 }
 
 
-static void qcrypto_cipher_aes_ecb_encrypt(AES_KEY *key,
+static void qcrypto_cipher_aes_ecb_encrypt(const AES_KEY *key,
                                            const void *in,
                                            void *out,
                                            size_t len)
@@ -100,7 +100,7 @@ static void qcrypto_cipher_aes_ecb_encrypt(AES_KEY *key,
 }
 
 
-static void qcrypto_cipher_aes_ecb_decrypt(AES_KEY *key,
+static void qcrypto_cipher_aes_ecb_decrypt(const AES_KEY *key,
                                            const void *in,
                                            void *out,
                                            size_t len)
@@ -133,8 +133,7 @@ static void qcrypto_cipher_aes_xts_encrypt(const void *ctx,
 {
     const QCryptoCipherBuiltinAESContext *aesctx = ctx;
 
-    qcrypto_cipher_aes_ecb_encrypt((AES_KEY *)&aesctx->enc,
-                                   src, dst, length);
+    qcrypto_cipher_aes_ecb_encrypt(&aesctx->enc, src, dst, length);
 }
 
 
@@ -145,8 +144,7 @@ static void qcrypto_cipher_aes_xts_decrypt(const void *ctx,
 {
     const QCryptoCipherBuiltinAESContext *aesctx = ctx;
 
-    qcrypto_cipher_aes_ecb_decrypt((AES_KEY *)&aesctx->dec,
-                                   src, dst, length);
+    qcrypto_cipher_aes_ecb_decrypt(&aesctx->dec, src, dst, length);
 }