[WineNAS] fix crash.

[Eric Pouech]

ChangeLog:
[WineNAS] fix crash
- return correct MM error code when no connection to server has been opened
- don't close the AU driver if it hasn't been opened

  dlls/winmm/winenas/audio.c |    9 ++++++---
  1 files changed, 6 insertions(+), 3 deletions(-)

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