Resolve clippy map_unwrap_or lint in demo
diff --git a/demo/src/main.rs b/demo/src/main.rs
index dca596a..458f1f2 100644
--- a/demo/src/main.rs
+++ b/demo/src/main.rs
@@ -38,7 +38,7 @@
 pub fn next_chunk(buf: &mut MultiBuf) -> &[u8] {
     let next = buf.chunks.get(buf.pos);
     buf.pos += 1;
-    next.map(Vec::as_slice).unwrap_or(&[])
+    next.map_or(&[], Vec::as_slice)
 }
 
 fn main() {