This patch fixes#4711.
The problem here is that the browser sometimes will shutdown some of our
exploit's connections (in my testing, all Java), and that will cause Ruby
to call a rb_sys_fail with "getpeername(2)". The error goes all the
way to Rex::IO::StreamServer's monitor_listener method, which triggers a
"break" to quit monitoring. And then this causes another chain of reactions
that eventually forces BrowserAutoPwn to quit completely (while the
JavaScript on the browser is still running)
sinn3r
22811257db