drm/amdgpu: Check num_gfx_rings for gfx v9_0 rb setup.
[ Upstream commit c3519383 ] No need to set up rb when no gfx rings. Signed-off-by: Candice Li <candice.li@amd.com> Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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c15c2c2c
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