Fixing the error caused by passing the QByteArray to mask method

QWsSocket.h: In constructor ‘QWsSocket::QWsSocket(QObject*, QTcpSocket*, EWebsocketVersion)’:
QWsSocket.h:148:13: warning: ‘QWsSocket::maskingKey’ will be initialized after [-Wreorder]
QWsSocket.h:138:7: warning:   ‘bool QWsSocket::serverSideSocket’ [-Wreorder]
QWsSocket.cpp:13:1: warning:   when initialized here [-Wreorder]
QWsSocket.cpp: In member function ‘virtual void QWsSocket::close(QWsSocket::ECloseStatusCode, QString)’:
QWsSocket.cpp:126:62: error: no matching function for call to ‘QWsSocket::mask(QByteArray, QByteArray&)’
QWsSocket.cpp:126:62: note: candidate is:
QWsSocket.h:161:20: note: static QByteArray QWsSocket::mask(QByteArray&, QByteArray&)
QWsSocket.h:161:20: note:   no known conversion for argument 1 from ‘QByteArray’ to ‘QByteArray&’
Merge pull request #11 from vivekgalatage/patch-1

Fixing the error caused by passing the QByteArray to mask method