Update needed for Rust v1.73.0

Remove redundancy
Bug: 303252546
Test: ./test_compiler.py --prebuilt-path dist/rust-dev.tar.xz  --target aosp_cf_x86_64_phone --image

Change-Id: Ia4366c2694c235f8931eea56d13548f08805952f
diff --git a/keystore2/src/database.rs b/keystore2/src/database.rs
index 08361b1..9d2da8c 100644
--- a/keystore2/src/database.rs
+++ b/keystore2/src/database.rs
@@ -5049,7 +5049,6 @@
         for storage in increased_storage_types {
             // Verify the expected storage increased.
             let new = db.get_storage_stat(storage).unwrap();
-            let storage = storage;
             let old = &baseline[&storage.0];
             assert!(new.size >= old.size, "{}: {} >= {}", storage.0, new.size, old.size);
             assert!(