Fix clippy warnings && tests

src/thread.rs

@@ -258,7 +258,7 @@ impl<'lua> Thread<'lua> {
         A: ToLuaMulti<'lua>,
         R: FromLuaMulti<'lua>,
     {
-        let args = args.to_lua_multi(&self.0.lua);
+        let args = args.to_lua_multi(self.0.lua);
         AsyncThread {
             thread: self,
             args0: RefCell::new(Some(args)),

src/types.rs

@@ -117,8 +117,8 @@ impl<'lua> PartialEq for LuaRef<'lua> {
         unsafe {
             let _sg = StackGuard::new(lua.state);
             assert_stack(lua.state, 2);
-            lua.push_ref(&self);
-            lua.push_ref(&other);
+            lua.push_ref(self);
+            lua.push_ref(other);
             ffi::lua_rawequal(lua.state, -1, -2) == 1
         }
     }