fix(rmdir): dont test existence

Similar to 4b8f5754

lib/api/unlink.js

@@ -18,9 +18,6 @@ var BigInt = require('../tools/bigint');
 module.exports = function unlink(path, cb) {
   var connection = this;
 
-  connection.exists(path, function(err, exists) {
-    if (err) cb && cb(err);
-    else if (exists) {
   // SMB2 open file
   SMB2Request('create', { path: path }, connection, function(err, file) {
     if (err) cb && cb(err);
@@ -44,8 +41,4 @@ module.exports = function unlink(path, cb) {
         }
       );
   });
-    } else {
-      cb(new Error('File does not exists'));
-    }
-  });
 };