util: remove unused fast path in internal debuglog

The internal `debuglog()` is never called with 0 parameters. Remove the
fast-path for that situation. If it ever occurs, it will fall through to
the default path.

PR-URL: https://github.com/nodejs/node/pull/41605
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Michaël Zasso <targos@protonmail.com>

lib/internal/util/debuglog.js

@@ -81,7 +81,6 @@ function debuglog(set, cb) {
     if (typeof cb === 'function')
       cb(debug);
     switch (args.length) {
-      case 0: return debug();
       case 1: return debug(args[0]);
       case 2: return debug(args[0], args[1]);
       default: return debug(...new SafeArrayIterator(args));
@@ -95,7 +94,6 @@ function debuglog(set, cb) {
   };
   const logger = (...args) => {
     switch (args.length) {
-      case 0: return debug();
       case 1: return debug(args[0]);
       case 2: return debug(args[0], args[1]);
       default: return debug(...new SafeArrayIterator(args));