dmaengine: tegra-apb: Remove duplicated residue calculation
The calculation of the DMA residue for the Tegra APB DMA is duplicated in two places in the tegra_dma_tx_status() function. Remove this duplicated code by moving calculation to the end of the function and only calculating if we found a valid descriptor. Signed-off-by: Jon Hunter <jonathanh@nvidia.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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