drm/radeon: check if BO_VA is set before adding it to the invalidation list
Otherwise we try to clear BO_VAs without an address. Fixes: https://bugs.freedesktop.org/show_bug.cgi?id=91141Signed-off-by: NChristian König <christian.koenig@amd.com> Test-by: hadack@gmx.de Tested-by: NMichel Dänzer <michel.daenzer@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
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