drm/vmwgfx: Convert to new IDA API
Reorder allocation to avoid an awkward lock/unlock/lock sequence. Simpler code due to being able to use ida_alloc_max(), even if we can't eliminate the driver's spinlock. Signed-off-by: Matthew Wilcox <willy@infradead.org> Reviewed-by: Sinclair Yeh <syeh@vmware.com>
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