radeon/winsys: fix winsys VM handling
radeon/winsys: fix winsys VM handling

Move releasing the VM area after closing the bo handle.

This partially fixes: https://bugs.freedesktop.org/show_bug.cgi?id=45018

Signed-off-by: Christian König <6000eae0bbe6bd1545a6e60916fedb2a5946bdd4@vodafone.de>
Reviewed-by: Alex Deucher <08dc22c6156113f2deff178e35e3ed9b24d6af9e@amd.com>

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