dmaengine: fsl-edma: Adjust indentation

Fix indentation and remove unneeded space after 'return' keyword.  This
fixes checkpatch warning:
    WARNING: Statements should start on a tabstop

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>