bqsr: Fix read indexing within thrust::for_each calls
bqsr: Fix read indexing within thrust::for_each calls

Change-Id: I9fa7478178c7d1ddaf29285c45b027030d18708f

[git-p4: depot-paths = "//sw/gpgpu/nvbio/bqsr/": change = 18886517]

NVlabs/firepony,NVlabs/firepony,NVlabs/firepony,broadinstitute/firepony,broadinstitute/firepony,broadinstitute/firepony,broadinstitute/firepony,NVlabs/firepony