icmpv6_csum() uses wrong format. It happened to produce correct value
for csum.

Signed-off-by: Isaku Yamahata <[email protected]>
---
 ryu/tests/unit/packet/test_icmpv6.py |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/ryu/tests/unit/packet/test_icmpv6.py 
b/ryu/tests/unit/packet/test_icmpv6.py
index 2fe5891..bc447d4 100644
--- a/ryu/tests/unit/packet/test_icmpv6.py
+++ b/ryu/tests/unit/packet/test_icmpv6.py
@@ -35,8 +35,8 @@ LOG = logging.getLogger(__name__)
 
 
 def icmpv6_csum(prev, buf):
-    ph = struct.pack('!16s16sBBH', prev.src, prev.dst, 0, prev.nxt,
-                     prev.payload_length)
+    ph = struct.pack('!16s16sI3xB', prev.src, prev.dst,
+                     prev.payload_length, prev.nxt)
     h = bytearray(buf)
     struct.pack_into('!H', h, 2, 0)
 
-- 
1.7.10.4


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