OpenSSL: Use a correct EVP_CIPHER_CTX freeing function on an error path

aes_encrypt_init() used incorrect function to free the EVP_CIPHER_CTX
allocated within this function. Fix that to use the OpenSSL function for
freeing the context.

Signed-off-by: Jouni Malinen <j@w1.fi>

src/crypto/crypto_openssl.c

@@ -412,7 +412,7 @@ void * aes_encrypt_init(const u8 *key, size_t len)
 	if (ctx == NULL)
 		return NULL;
 	if (EVP_EncryptInit_ex(ctx, type, NULL, key, NULL) != 1) {
-		os_free(ctx);
+		EVP_CIPHER_CTX_free(ctx);
 		return NULL;
 	}
 	EVP_CIPHER_CTX_set_padding(ctx, 0);