drm_vblank_get: don't WARN_ON in case vblanks are not initialized
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com> Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
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Signed-off-by: NGerd Hoffmann <kraxel@redhat.com> Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>