remove a warning

iOSClient/Library/OCCommunicationLib/OCWebDavClient/OCWebDAVClient.m

@@ -614,7 +614,7 @@ NSString const *OCWebDAVModificationDateKey	= @"modificationdate";
     _requestMethod = @"POST";
     
     NSMutableURLRequest *request = [self sharedRequestWithMethod:_requestMethod path:serverPath parameters:nil timeout:k_timeout_webdav];
-    _postStringForShare = [NSString stringWithFormat: @"path=%@&shareType=3&permissions=%lu&password=%@",filePath,permission,password];
+    _postStringForShare = [NSString stringWithFormat: @"path=%@&shareType=3&permissions=%ld&password=%@", filePath, (long)permission, password];
     [request setHTTPBody:[_postStringForShare dataUsingEncoding:NSUTF8StringEncoding]];
     
     OCHTTPRequestOperation *operation = [self mr_operationWithRequest:request onCommunication:sharedOCCommunication success:success failure:failure];