Fix following coccicheck warning:

./arch/powerpc/platforms/pseries/iommu.c:924:1-28: WARNING: Function
for_each_node_with_property should have of_node_put() before break

Early exits from for_each_node_with_property should decrement the
node reference counter.

Signed-off-by: Wan Jiabing <wanjiab...@vivo.com>
---
 arch/powerpc/platforms/pseries/iommu.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/platforms/pseries/iommu.c 
b/arch/powerpc/platforms/pseries/iommu.c
index 269f61d519c2..c140aa683f66 100644
--- a/arch/powerpc/platforms/pseries/iommu.c
+++ b/arch/powerpc/platforms/pseries/iommu.c
@@ -929,8 +929,10 @@ static void find_existing_ddw_windows_named(const char 
*name)
                }
 
                window = ddw_list_new_entry(pdn, dma64);
-               if (!window)
+               if (!window) {
+                       of_node_put(pdn);
                        break;
+               }
 
                spin_lock(&dma_win_list_lock);
                list_add(&window->list, &dma_win_list);
-- 
2.20.1

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