src: remove unused static variable

PR-URL: https://github.com/nodejs/node/pull/15458
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

src/module_wrap.cc

@@ -327,7 +327,7 @@ inline const struct read_result read_file(uv_file file) {
 struct file_check {
   bool failed = true;
   uv_file file = -1;
-} file_check;
+};
 inline const struct file_check check_file(URL search,
                                           bool close = false,
                                           bool allow_dir = false) {