Fix clippy error

Author: hkmatsumoto

clippy_lints/src/create_dir.rs

@@ -1,7 +1,7 @@
 use crate::utils::{match_qpath, paths, snippet, span_lint_and_sugg};
 use if_chain::if_chain;
 use rustc_errors::Applicability;
-use rustc_hir::*;
+use rustc_hir::{Expr, ExprKind};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_session::{declare_lint_pass, declare_tool_lint};