dmaengine: iop-adma: clean up an indentation issue

There is a statement that is indented too deeply, remove
the extraneous indentation.
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20191112191143.282814-1-colin.king@canonical.comSigned-off-by: Vinod Koul <vkoul@kernel.org>