net/lwip: fix the wrong use of nd6_stat
net/lwip: fix the wrong use of nd6_stat

fix the wrong use of nd6_stat status

Change-Id: Ie891f02972418e9b55a44640d7566a788ab0e858
Signed-off-by: jisuu.kim <800dec47d2987cee7cc3d7aee71bc11b56f5042e@samsung.com>

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