egl/x11: don't leak xfixes_query in the error path

If we get a xfixes v1.x we'll error out, without freeing the
xfixes_query reply.

Cc: <mesa-stable@lists.freedesktop.org>
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com>

src/egl/drivers/dri2/platform_x11.c

@@ -646,6 +646,7 @@ dri2_x11_connect(struct dri2_egl_display *dri2_dpy)
        error != NULL || xfixes_query->major_version < 2) {
       _eglLog(_EGL_WARNING, "DRI2: failed to query xfixes version");
       free(error);
+      free(xfixes_query);
       return EGL_FALSE;
    }
    free(xfixes_query);