Make sure to drop the reference taken when looking up the crossbar
platform device during dra7x route allocation.

Note that commit 615a4bfc426e ("dmaengine: ti: Add missing put_device in
ti_dra7_xbar_route_allocate") fixed the leak in the error paths but the
reference is still leaking on successful allocation.

Fixes: a074ae38f859 ("dmaengine: Add driver for TI DMA crossbar on DRA7x")
Fixes: 615a4bfc426e ("dmaengine: ti: Add missing put_device in ti_dra7_xbar_route_allocate")
Cc: stable@vger.kernel.org	# 4.2: 615a4bfc426e
Cc: Peter Ujfalusi <peter.ujfalusi@ti.com>
Cc: Miaoqian Lin <linmq006@gmail.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
---
 drivers/dma/ti/dma-crossbar.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/dma/ti/dma-crossbar.c b/drivers/dma/ti/dma-crossbar.c
index 7f17ee87a6dc..e52b0e139900 100644
--- a/drivers/dma/ti/dma-crossbar.c
+++ b/drivers/dma/ti/dma-crossbar.c
@@ -288,6 +288,8 @@ static void *ti_dra7_xbar_route_allocate(struct of_phandle_args *dma_spec,
 
 	ti_dra7_xbar_write(xbar->iomem, map->xbar_out, map->xbar_in);
 
+	put_device(&pdev->dev);
+
 	return map;
 }
 
-- 
2.51.0