Do not access SSL struct directly in TLS1_get_version and TLS1_get_client_version macros

Reviewed-by: NRich Salz <rsalz@openssl.org>
Reviewed-by: NTim Hudson <tjh@openssl.org>
Reviewed-by: NMatt Caswell <matt@openssl.org>

include/openssl/tls1.h

@@ -179,10 +179,10 @@ extern "C" {
 # define TLS1_2_VERSION_MINOR            0x03
 
 # define TLS1_get_version(s) \
-                ((s->version >> 8) == TLS1_VERSION_MAJOR ? s->version : 0)
+                ((SSL_version(s) >> 8) == TLS1_VERSION_MAJOR ? SSL_version(s) : 0)
 
 # define TLS1_get_client_version(s) \
-                ((s->client_version >> 8) == TLS1_VERSION_MAJOR ? s->client_version : 0)
+                ((SSL_client_version(s) >> 8) == TLS1_VERSION_MAJOR ? SSL_client_version(s) : 0)
 
 # define TLS1_AD_DECRYPTION_FAILED       21
 # define TLS1_AD_RECORD_OVERFLOW         22