Remove "iova" check from geni_se_tx_dma_unprep and geni_se_rx_dma_unprep
functions as checking with dma_mapping_error() is enough.

Signed-off-by: Roja Rani Yarubandi <rojay@codeaurora.org>
Link: https://lore.kernel.org/r/20201030145959.505-2-rojay@codeaurora.org


Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>