dmaengine: idxd: fix device leaks on compat bind and unbind

dmaengine: idxd: fix device leaks on compat bind and unbind

Make sure to drop the reference taken when looking up the idxd device as
part of the compat bind and unbind sysfs interface.

Fixes: 6e7f3ee97bbe ("dmaengine: idxd: move dsa_drv support to compatible mode")
Cc: stable@vger.kernel.org	# 5.15
Cc: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://patch.msgid.link/20251117161258.10679-7-johan@kernel.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>