- use pthread_atfork() to disable open sound streams in the child after a fork.

- use pthread_atfork() to disable open sound streams in the child after a fork.
  Obviusly sound won't work in child process but at least we don't leak fds
  from the parent. Now any operation on the device fd in the child will result
  in an EBADF error, which seems somewhat clean to me.

- flush our unix socket properly on RESET ioctl

git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@953 fefdeb5f-60dc-0310-8127-8f9354f1896f