Shorten fs.write() promise code

lib/fs/index.js

@@ -83,22 +83,12 @@ exports.read = function (fd, buffer, offset, length, position, callback) {
 // fs.write(fd, buffer[, offset[, length[, position]]], callback)
 // OR
 // fs.write(fd, string[, position[, encoding]], callback)
-// so we need to handle both cases
+// We need to handle both cases, so we use ...args
 exports.write = function (fd, buffer, ...args) {
   if (typeof args[args.length - 1] === 'function') {
     return fs.write(fd, buffer, ...args)
   }
 
-  // Check for old, depricated fs.write(fd, string[, position[, encoding]], callback)
-  if (typeof buffer === 'string') {
-    return new Promise((resolve, reject) => {
-      fs.write(fd, buffer, ...args, (err, bytesWritten, buffer) => {
-        if (err) return reject(err)
-        resolve({ bytesWritten, buffer })
-      })
-    })
-  }
-
   return new Promise((resolve, reject) => {
     fs.write(fd, buffer, ...args, (err, bytesWritten, buffer) => {
       if (err) return reject(err)