init: fix clang-tidy performance issues

Test: boot, init unit tests
Change-Id: Iccf34d2fedfa543dd9f29e010cbb6d8fe9cf5983
diff --git a/init/keychords.cpp b/init/keychords.cpp
index d0ca3e7..5f2682b 100644
--- a/init/keychords.cpp
+++ b/init/keychords.cpp
@@ -285,7 +285,7 @@
 
 void Keychords::Start(Epoll* epoll, std::function<void(const std::vector<int>&)> handler) {
     epoll_ = epoll;
-    handler_ = handler;
+    handler_ = std::move(handler);
     if (entries_.size()) GeteventOpenDevice();
 }