[WinMM]: driver unloading.

[Eric Pouech]

ChangeLog:
- properly handle drivers' unloading when no session instance
   of the driver has been created

  dlls/winmm/driver.c |    8 ++++++--
  dlls/winmm/winemm.h |    7 +++++--
  2 files changed, 11 insertions(+), 4 deletions(-)

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