added missing struct field
added missing struct field

[git-p4: depot-paths = "//sw/gpgpu/nvbio/main/": change = 18519027]

kimrutherford/nvbio,NVlabs/nvbio,NVlabs/nvbio,kimrutherford/nvbio,kimrutherford/nvbio,NVlabs/nvbio,kimrutherford/nvbio,NVlabs/nvbio