crypto: move _scrypt call out of handleError funct

This commit moves the _scrypt function call out of the handleError
function, which now only takes in an error object as its parameter.

The motivation for this is to hopefully improve readability as it was
not clear to me the first time I stepped through the code where the
actual call to _scrypt was.

PR-URL: #28318
Reviewed-By: Yongsheng Zhang <[email protected]>
Reviewed-By: Benjamin Gruenbaum <[email protected]>
Reviewed-By: Ben Noordhuis <[email protected]>
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Rich Trott <[email protected]>
Reviewed-By: Tobias Nießen <[email protected]>
Reviewed-By: James M Snell <[email protected]>

lib/internal/crypto/scrypt.js

@@ -44,23 +44,21 @@ function scrypt(password, salt, keylen, options, callback = defaults) {
     callback.call(wrap, null, keybuf.toString(encoding));
   };
 
-  handleError(keybuf, password, salt, N, r, p, maxmem, wrap);
+  handleError(_scrypt(keybuf, password, salt, N, r, p, maxmem, wrap));
 }
 
 function scryptSync(password, salt, keylen, options = defaults) {
   options = check(password, salt, keylen, options);
   const { N, r, p, maxmem } = options;
   ({ password, salt, keylen } = options);
   const keybuf = Buffer.alloc(keylen);
-  handleError(keybuf, password, salt, N, r, p, maxmem);
+  handleError(_scrypt(keybuf, password, salt, N, r, p, maxmem));
   const encoding = getDefaultEncoding();
   if (encoding === 'buffer') return keybuf;
   return keybuf.toString(encoding);
 }
 
-function handleError(keybuf, password, salt, N, r, p, maxmem, wrap) {
-  const ex = _scrypt(keybuf, password, salt, N, r, p, maxmem, wrap);
-
+function handleError(ex) {
   if (ex === undefined)
     return;