server: Fix for possible desktop variable being NULL when set_process_default_desktop is called

[Robert Shearman]

ChangeLog:
The desktop variable could be NULL when set_process_default_desktop is
called, so check for this. (Found by Coverity).

  server/winstation.c |    2 +-
  1 files changed, 1 insertions(+), 1 deletions(-)

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