Allow a zero length extension block

It is valid for an extension block to be present in a ClientHello, but to
be of zero length.

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>

ssl/t1_lib.c

@@ -1016,12 +1016,12 @@ int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d,
 
     s->srtp_profile = NULL;
 
-    if (data >= (d + n - 2)) {
-        if (data != d + n)
-            goto err;
-        else
+    if (data == d + n)
         goto ri_check;
-    }
+
+    if (data > (d + n - 2))
+        goto err;
+
     n2s(data, len);
 
     if (data > (d + n - len))