fix build

bffhd/db/index.rs

@@ -29,6 +29,6 @@ impl<I: AsRef<[u8]>, A: Adapter> Index<I, A> {
     pub fn get<T: Transaction>(
         &self, txn: &T, lookup: I,
     ) -> Result<Option<A::Item>, db::Error> {
-        self.db.get(txn, lookup)
+        self.db.get(txn, &lookup)
     }
 }