module: ignore module path after null character

Null char as the first char as the path component
of first argument of require causes a node crash.
Ignoring null and all chars after that in require path.

Fixes: nodejs#13787

lib/module.js

@@ -511,7 +511,7 @@ Module.prototype.require = function(path) {
   assert(path, 'missing path');
   assert(typeof path === 'string', 'path must be a string');
   // Ignore part of the path after null character if it exists
-  if (path.indexOf('\u0000') != -1) {
+  if (path.indexOf('\u0000') !== -1) {
     path = path.split('\u0000')[0];
   }
   return Module._load(path, this, /* isMain */ false);