Update libssl to NSS 3.18 RTM

net/third_party/nss/ssl/sslnonce.c

Index: net/third_party/nss/ssl/sslnonce.c
diff --git a/net/third_party/nss/ssl/sslnonce.c b/net/third_party/nss/ssl/sslnonce.c
index 3e42bed34e5f528bb98dd1038b6d0a70b0b7e53b..28ad36435ccf1e3f8c6581a63fb7d5f63c0fbb4e 100644
--- a/net/third_party/nss/ssl/sslnonce.c
+++ b/net/third_party/nss/ssl/sslnonce.c
@@ -441,6 +441,8 @@ ssl3_SetSIDSessionTicket(sslSessionID *sid,
 {
     PORT_Assert(sid);
     PORT_Assert(newSessionTicket);
+    PORT_Assert(newSessionTicket->ticket.data);
+    PORT_Assert(newSessionTicket->ticket.len != 0);
 
     /* if sid->u.ssl3.lock, we are updating an existing entry that is already
      * cached or was once cached, so we need to acquire and release the write
@@ -449,10 +451,6 @@ ssl3_SetSIDSessionTicket(sslSessionID *sid,
      */
     if (sid->u.ssl3.lock) {
 	NSSRWLock_LockWrite(sid->u.ssl3.lock);
-
-	/* A server might have sent us an empty ticket, which has the
-	 * effect of clearing the previously known ticket.
-	 */
 	if (sid->u.ssl3.locked.sessionTicket.ticket.data) {
 	    SECITEM_FreeItem(&sid->u.ssl3.locked.sessionTicket.ticket,
 			     PR_FALSE);