Rename nested_meta_item to meta_item_inner

Author: codemountains

src/tools/rustfmt/src/overflow.rs

@@ -184,8 +184,7 @@ impl<'a> OverflowableItem<'a> {
                 MacroArg::Item(..) => len == 1,
                 MacroArg::Keyword(..) => false,
             },
-            OverflowableItem::MetaItemInner(nested_meta_item) if len == 1 => match nested_meta_item
-            {
+            OverflowableItem::MetaItemInner(meta_item_inner) if len == 1 => match meta_item_inner {
                 ast::MetaItemInner::Lit(..) => false,
                 ast::MetaItemInner::MetaItem(..) => true,
             },