fix compiler error with gcc complaining about parentheses

dwl.c: In function ‘unmaplayersurface’:
dwl.c:2253:9: error: suggest parentheses around assignment used as truth value [-Werror=parentheses]
 2253 |         layersurface->layer_surface->mapped = layersurface->mapped = 0;
      |         ^~~~~~~~~~~~
cc1: all warnings being treated as errors
make: *** [<builtin>: dwl.o] Error 1

clang not affected

1 files changed, 1 insertions, 1 deletions

diff --git a/dwl.c b/dwl.c
index ca0368a..e4bed14 100644
--- a/dwl.c
+++ b/dwl.c
@@ -2250,7 +2250,7 @@ toggleview(const Arg *arg)
 void
 unmaplayersurface(LayerSurface *layersurface)
 {
-	layersurface->layer_surface->mapped = layersurface->mapped = 0;
+	layersurface->layer_surface->mapped = (layersurface->mapped = 0);
 	wlr_scene_node_set_enabled(layersurface->scene, 0);
 	if (layersurface->layer_surface->surface ==
 			seat->keyboard_state.focused_surface)