r600g: Only compare active vertex elements

Signed-off-by: Tilman Sauerbeck <tilman@code-monkey.de>

src/gallium/drivers/r600/r600_shader.c

@@ -274,7 +274,8 @@ static int r600_shader_update(struct pipe_context *ctx, struct r600_pipe_shader
 		return 0;
 	/* doing a full memcmp fell over the refcount */
 	if ((rshader->vertex_elements.count == rctx->vertex_elements->count) &&
-	    (!memcmp(&rshader->vertex_elements.elements, &rctx->vertex_elements->elements, 32 * sizeof(struct pipe_vertex_element)))) {
+	    (!memcmp(&rshader->vertex_elements.elements, &rctx->vertex_elements->elements,
+                     rctx->vertex_elements->count * sizeof(struct pipe_vertex_element)))) {
 		return 0;
 	}
 	rshader->vertex_elements = *rctx->vertex_elements;