bytes: fix unused_imports compiler warning

Started to appear since `rustc 1.75.0-beta.1`.

Author: r-bk

src/bytes/mod.rs

@@ -10,7 +10,7 @@ pub use reader::*;
 cfg_any_client! {
     mod wcursor;
     pub use wcursor::*;
-}
 
-mod writer;
-pub use writer::*;
+    mod writer;
+    pub use writer::*;
+}