dri3_open: don't leak the reply

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=90073
Signed-off-by: Guillaume Desmottes <guillaume.desmottes@collabora.co.uk>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>

src/glx/dri3_glx.c

@@ -1679,6 +1679,8 @@ dri3_open(Display *dpy,
    fd = xcb_dri3_open_reply_fds(c, reply)[0];
    fcntl(fd, F_SETFD, FD_CLOEXEC);
 
+   free(reply);
+
    return fd;
 }