Set first_packet for TLS clients

Version negotiation was broken (one of the late changes in the review
process broke it). The problem is that TLS clients do not set first_packet,
whereas TLS/DTLS servers and DTLS clients do. The simple fix is to set
first_packet for TLS clients too.
Reviewed-by: NKurt Roeckx <kurt@openssl.org>

ssl/s3_clnt.c

@@ -947,7 +947,6 @@ int ssl3_get_server_hello(SSL *s)
      * Hello verify request and/or server hello version may not match so set
      * first packet if we're negotiating version.
      */
-    if (SSL_IS_DTLS(s))
     s->first_packet = 1;
 
     n = s->method->ssl_get_message(s,
@@ -957,8 +956,8 @@ int ssl3_get_server_hello(SSL *s)
     if (!ok)
         return ((int)n);
 
-    if (SSL_IS_DTLS(s)) {
     s->first_packet = 0;
+    if (SSL_IS_DTLS(s)) {
         if (s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST) {
             if (s->d1->send_cookie == 0) {
                 s->s3->tmp.reuse_message = 1;