drm/nv50/fb: prevent oops on chipsets without compression tags
Unconditionally create the tagram mm, even if there's zero tags.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
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Unconditionally create the tagram mm, even if there's zero tags.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>