server: Delay destruction of file object in set_irp_result.

[Sebastian Lackner]

For https://bugs.winehq.org/show_bug.cgi?id=38764

Under specific situations calling set_irp_result can cause a wineserver crash
because the function assumes, that irp->file has a refcount greater than 1.
The call to 'release_object( file );' can destroy the associated file, but
later 'list_remove( &irp->dev_entry );' is executed which assumes that the
file still exists.
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