via-cuda: Initialize data_index early and increment consistently
Initialize data_index where appropriate to improve readability and assist debugging. This change doesn't affect driver behaviour. I prefer to see current_req->data[data_index++] in place of current_req->data[0] or current_req->data[1] inasmuchas it becomes obvious what the data_index variable does. Moreover, the actual value of data_index when examined at any given moment tells me something about prior events, which did prove helpful. Tested-by: NStan Johnson <userm57@yahoo.com> Signed-off-by: NFinn Thain <fthain@telegraphics.com.au> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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