Constify ssl_cert_type()

Reviewed-by: NRichard Levitte <levitte@openssl.org>

ssl/ssl_locl.h

@@ -1858,7 +1858,7 @@ __owur CERT_PKEY *ssl_get_server_send_pkey(SSL *s);
 __owur int ssl_get_server_cert_serverinfo(SSL *s, const unsigned char **serverinfo,
                                    size_t *serverinfo_length);
 __owur EVP_PKEY *ssl_get_sign_pkey(SSL *s, const SSL_CIPHER *c, const EVP_MD **pmd);
-__owur int ssl_cert_type(X509 *x, const EVP_PKEY *pkey);
+__owur int ssl_cert_type(const X509 *x, const EVP_PKEY *pkey);
 void ssl_set_masks(SSL *s);
 __owur STACK_OF(SSL_CIPHER) *ssl_get_ciphers_by_id(SSL *s);
 __owur int ssl_verify_alarm_type(long type);

ssl/statem/statem_lib.c

@@ -520,7 +520,7 @@ int tls_get_message_body(SSL *s, unsigned long *len)
     return 1;
 }
 
-int ssl_cert_type(X509 *x, const EVP_PKEY *pk)
+int ssl_cert_type(const X509 *x, const EVP_PKEY *pk)
 {
     if (pk == NULL &&
         (pk = X509_get0_pubkey(x)) == NULL)