fix buffer overflow in ifaddrs.c
fix buffer overflow in ifaddrs.c

jenkins: ok to test

Signed-off-by: Tw <9badae619f85d6141021d55221ac5bc6f13849e6@gmail.com>

hfuCN/lxc,GreatFruitOmsk/lxc,thmo/lxc,terceiro/lxc,thmo/lxc,tych0/lxc,hallyn/lxc,federicobriata/lxc,GreatFruitOmsk/lxc,LynxChaus/lxc,aeris/lxc,hfuCN/lxc,QingweiPeterLan/cs188-lxc,akshaykarle/lxc,tych0/lxc,QingweiPeterLan/cs188-lxc,bostjan/lxc,bostjan/lxc,cjwatson/lxc,LynxChaus/lxc,cjwatson/lxc,LynxChaus/lxc,ss1h2a3tw/lxc,caglar10ur/lxc,aeris/lxc,akshaykarle/lxc,caglar10ur/lxc,ysbnim/lxc,caglar10ur/lxc,thmo/lxc,hallyn/lxc,tych0/lxc,hallyn/lxc,ss1h2a3tw/lxc,ysbnim/lxc,QingweiPeterLan/cs188-lxc,aeris/lxc,ss1h2a3tw/lxc,GreatFruitOmsk/lxc,terceiro/lxc,federicobriata/lxc,terceiro/lxc,federicobriata/lxc,cjwatson/lxc,hfuCN/lxc,ysbnim/lxc,akshaykarle/lxc,bostjan/lxc