Use Connection::roundtrip to block until compositor processes surface destruction

 src/main.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main.rs b/src/main.rs
index 8dcccb1..349cc3c 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1255,5 +1255,5 @@ fn main() {
     }
 
     drop(app);
-    let _ = conn_clone.flush();
+    let _ = conn_clone.roundtrip();
 }