Refactor: Cleanup one part of assign_ops lint Removes a lot of indentation and separates lint emission from lint logic. Only touches the `hir::ExprKind::AssignOp` part of the lint.
Refactor: Cleanup one part of assign_ops lint Removes a lot of indentation and separates lint emission from lint logic. Only touches the `hir::ExprKind::AssignOp` part of the lint.