drm/nouveau/kms/nv50-: fix case where notifier buffer is at offset 0
VRAM offset 0 is a valid address, triggered on GA102.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
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VRAM offset 0 is a valid address, triggered on GA102.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>