one if (m_mustMask) is enough
one if (m_mustMask) is enough

Change-Id: I6cb89b981b70f10510319bfb51b77874e2a4d85a
Reviewed-by: Kurt Pattyn <da83d6ada5df79ff647b4271d0d788c6f1bafca2@gmail.com>

SfietKonstantin/qtwebsockets,pixty/qtwebsockets,pixty/qtwebsockets,remimixlr/QtWebsocket