drm/ttm: use ttm put pages function to properly restore cache attribute
On failure we need to make sure the page we free has wb cache attribute. Do this pas call the proper ttm page helper function. Signed-off-by: NJerome Glisse <jglisse@redhat.com> Reviewed-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com> Reviewed-by: NThomas Hellstrom <thellstrom@vmware.com>
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