fix(rmdir): dont test existence

Test pre-condition can leads to race-conditions.
Also current code was hiding SMB error.

lib/api/rmdir.js

@@ -18,14 +18,8 @@ var SMB2Forge = require('../tools/smb2-forge'),
 module.exports = function rmdir(path, cb) {
   var connection = this;
 
-  connection.exists(path, function(err, exists) {
-    if (err) cb && cb(err);
-    else if (exists) {
   // SMB2 open file
-      SMB2Request('open_folder', { path: path }, connection, function(
-        err,
-        file
-      ) {
+  SMB2Request('open_folder', { path: path }, connection, function(err, file) {
     if (err) cb && cb(err);
     // SMB2 query directory
     else
@@ -47,8 +41,4 @@ module.exports = function rmdir(path, cb) {
         }
       );
   });
-    } else {
-      cb(new Error('Folder does not exists'));
-    }
-  });
 };