anv/genX: Solve the vkCreateGraphicsPipelines crash
The crash is due to NULL pColorBlendState, which is legal if the pipeline has rasterization disabled or if the subpass of the render pass the pipeline is created against does not use any color attachments. Test: Sample subpasses from LunarG can run without crash Signed-off-by:Xu,Randy <randy.xu@intel.com> Reviewed-by:
Jason Ekstrand <jason@jlekstrand.net> Cc: "17.0 13.0" <mesa-stable@lists.freedesktop.org>