Fix session tickets

Commit 9ceb2426b0 (PACKETise ClientHello) broke session tickets by failing
to detect the session ticket extension in an incoming ClientHello. This
commit fixes the bug.

Reviewed-by: Emilia Käsper <emilia@openssl.org>
diff --git a/ssl/t1_lib.c b/ssl/t1_lib.c
index e37411c..f004288 100644
--- a/ssl/t1_lib.c
+++ b/ssl/t1_lib.c
@@ -3043,6 +3043,11 @@
                 break;
             }
             goto end;
+        } else {
+            if (!PACKET_forward(pkt, size)) {
+                retv = -1;
+                goto end;
+            }
         }
     }
     retv = 0;