dmaengine: mv_xor: fix child node refcount handling in early exit

commit 362f1bf98a upstream.

The for_each_child_of_node() loop requires explicit calls to
of_node_put() to decrement the child's refcount upon early exits (break,
goto, return).

Add the missing calls in the two early exits before the goto
instructions.

Cc: stable@vger.kernel.org
Fixes: f7d12ef53d ("dma: mv_xor: add Device Tree binding")
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Link: https://lore.kernel.org/r/20241011-dma_mv_xor_of_node_put-v1-1-3c2de819f463@gmail.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/dma/mv_xor.c

@@ -1393,6 +1393,7 @@ static int mv_xor_probe(struct platform_device *pdev)
 			irq = irq_of_parse_and_map(np, 0);
 			if (!irq) {
 				ret = -ENODEV;
+				of_node_put(np);
 				goto err_channel_add;
 			}
 
@@ -1401,6 +1402,7 @@ static int mv_xor_probe(struct platform_device *pdev)
 			if (IS_ERR(chan)) {
 				ret = PTR_ERR(chan);
 				irq_dispose_mapping(irq);
+				of_node_put(np);
 				goto err_channel_add;
 			}