i965: Initialize "separate" flag in VUE maps.

This was uninitialized, which resulted in weird looking printouts where
it appeared that the TCS output and TES input patch URB entries differed
in SSO/non-SSO layout.  There is no "separable" layout for both, as
they're tied together.

It should have no other actual effect.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Matt Turner <mattst88@gmail.com>

src/mesa/drivers/dri/i965/brw_vue_map.c

@@ -205,6 +205,9 @@ brw_compute_tess_vue_map(struct brw_vue_map *vue_map,
    /* I don't think anything actually uses this... */
    vue_map->slots_valid = vertex_slots;
 
+   /* separate isn't really meaningful, but make sure it's initialized */
+   vue_map->separate = false;
+
    vertex_slots &= ~(VARYING_BIT_TESS_LEVEL_OUTER |
                      VARYING_BIT_TESS_LEVEL_INNER);