powerpc/mm: dereference OF node "/chosen"

The form affinity for NUMA is set to 1 if the firmware supports
OPAL. Otherwise, we have to retrieve that from OF node "/chosen".
For the latter case, OF node "/chosen" was referred without
dereferencing.

The patch dereference OF node "/chosen" if necessary.

Signed-off-by: Gavin Shan <redacted>
---
 arch/powerpc/mm/numa.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index b6edbb3..5ca3a15 100644
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c

@@ -340,6 +340,8 @@ static int __init find_min_common_depth(void)
 				dbg("Using form 1 affinity\n");
 				form1_affinity = 1;
 			}
+
+			of_node_put(chosen);
 		}
 	}
 

-- 
1.7.9.5