Revert "dmaengine: imx-sdma: Fix memory leak"

This reverts commit 8a7aa4fe which is
commit 02939cd1

 upstream.

Andreas writes:
	This patch breaks our imx6 board with the attached trace.
	Reverting the patch makes it boot again.

Reported-by: Andreas Tobler <andreas.tobler@onway.ch>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Robin Gong <yibin.gong@nxp.com>
Cc: Vinod Koul <vkoul@kernel.org>
Cc: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>