anv_render_pass_compile() turns an unused attachment into a NULL
depth_stencil_attachment pointer so check that pointer before
accessing it.
Found with updates to existing CTS tests.
Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Fixes: 208be8eafa ("anv: Make subpass::depth_stencil_attachment a pointer")
Reviewed-by: Eric Engestrom <eric@engestrom.ch>
Reviewed-by: Juan A. Suarez <jasuarez@igalia.com>
Lionel Landwerlin
c9c8c2f7d7