Update crossbeam-channel to 0.5.2

Test: cd external/rust/crates && atest --host -c
Change-Id: I1dd8965902969ea654a06d17e78181d99dd7bb7e
diff --git a/benches/crossbeam.rs b/benches/crossbeam.rs
index 9870c98..1c05222 100644
--- a/benches/crossbeam.rs
+++ b/benches/crossbeam.rs
@@ -13,7 +13,7 @@
 
     #[bench]
     fn create(b: &mut Bencher) {
-        b.iter(|| unbounded::<i32>());
+        b.iter(unbounded::<i32>);
     }
 
     #[bench]