Fix clippy lint

Author: RiverDave

naga/src/back/msl/keywords.rs

@@ -422,6 +422,6 @@ pub static RESERVED_SET: RacyLock<KeywordSet> = RacyLock::new(|| {
             dot_function_names.push(leaked);
         }
     }
-    set.extend(dot_function_names.into_iter());
+    set.extend(dot_function_names);
     set
 });