tty: Use is_service_fd where appropriate

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

files.c

@@ -385,7 +385,7 @@ static int post_open_fd(int pid, FdinfoEntry *fe, struct file_desc *d)
 	if (!d->ops->post_open)
 		return 0;
 
-	if (fe->fd == get_service_fd(CTL_TTY_OFF))
+	if (is_service_fd(fe->fd, CTL_TTY_OFF))
 		return d->ops->post_open(d, fe->fd);
 
 	fle = file_master(d);

tty.c

@@ -345,7 +345,7 @@ static int tty_restore_ctl_terminal(struct file_desc *d, int fd)
 	int slave, ret = -1;
 	char pts_name[64];
 
-	if (fd != get_service_fd(CTL_TTY_OFF))
+	if (!is_service_fd(fd, CTL_TTY_OFF))
 		return 0;
 
 	snprintf(pts_name, sizeof(pts_name), PTS_FMT, info->tie->pty->index);