atomic_bitmap: Suppress clippy warning

Clippy complains about `clippy::redundant-clone` as the "cloned value is
neither consumed nor mutated". Since we just need to test the value,
what we are doing is fine too.

Suppress the warning.

Signed-off-by: Viresh Kumar <[email protected]>

Author: vireshk

src/bitmap/backend/atomic_bitmap.rs

@@ -191,6 +191,7 @@ mod tests {
         assert!(b.is_addr_set(256));
         assert!(!b.is_addr_set(384));
 
+        #[allow(clippy::redundant_clone)]
         let copy_b = b.clone();
         assert!(copy_b.is_addr_set(256));
         assert!(!copy_b.is_addr_set(384));