Revert "Move side-effect out of assert statement"

This reverts commit a0afedcd8f.

render/gles2/renderer.c

@@ -25,8 +25,7 @@ static struct wlr_gles2_renderer *gles2_get_renderer(
 static struct wlr_gles2_renderer *gles2_get_renderer_in_context(
 		struct wlr_renderer *wlr_renderer) {
 	struct wlr_gles2_renderer *renderer = gles2_get_renderer(wlr_renderer);
-	bool current = wlr_egl_is_current(renderer->egl);
-	assert(current);
+	assert(wlr_egl_is_current(renderer->egl));
 	return renderer;
 }