Fix some style issues identified during review

Reviewed-by: Rich Salz <rsalz@openssl.org>
diff --git a/ssl/t1_lib.c b/ssl/t1_lib.c
index bb4f292..3e592be 100644
--- a/ssl/t1_lib.c
+++ b/ssl/t1_lib.c
@@ -943,7 +943,7 @@
 
 static int tls_use_ticket(SSL *s)
 {
-    if (s->options & SSL_OP_NO_TICKET || SSL_IS_TLS13(s))
+    if ((s->options & SSL_OP_NO_TICKET) || SSL_IS_TLS13(s))
         return 0;
     return ssl_security(s, SSL_SECOP_TICKET, 0, 0, NULL);
 }