gallium/cso: unbind sampler views in cso_release_all()

src/gallium/auxiliary/cso_cache/cso_context.c

@@ -289,6 +289,8 @@ void cso_release_all( struct cso_context *ctx )
       ctx->pipe->bind_fs_state( ctx->pipe, NULL );
       ctx->pipe->bind_vs_state( ctx->pipe, NULL );
       ctx->pipe->bind_vertex_elements_state( ctx->pipe, NULL );
+      ctx->pipe->set_fragment_sampler_views(ctx->pipe, 0, NULL);
+      ctx->pipe->set_vertex_sampler_views(ctx->pipe, 0, NULL);
    }
 
    for (i = 0; i < PIPE_MAX_SAMPLERS; i++) {