i965: Release aux buffer when disabling ccs

Otherwise subsequent render cycles keep on using compression
and/or fast clear.

Signed-off-by: Topi Pohjolainen <topi.pohjolainen@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

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

@@ -2326,6 +2326,9 @@ intel_miptree_make_shareable(struct brw_context *brw,
    if (mt->mcs_buf) {
       intel_miptree_all_slices_resolve_color(brw, mt, 0);
       mt->no_ccs = true;
+      drm_intel_bo_unreference(mt->mcs_buf->bo);
+      free(mt->mcs_buf);
+      mt->mcs_buf = NULL;
    }
 }