session: Add parentheses to fix a build warning.

src/session.c

@@ -586,7 +586,7 @@ int ssh_get_status(ssh_session session) {
   if (socketstate & SSH_WRITE_PENDING) {
       r |= SSH_WRITE_PENDING;
   }
-  if (session->closed && (socketstate & SSH_CLOSED_ERROR) ||
+  if ((session->closed && (socketstate & SSH_CLOSED_ERROR)) ||
       session->session_state == SSH_SESSION_STATE_ERROR) {
     r |= SSH_CLOSED_ERROR;
   }