utils: lxc_deslashify() free memory
utils: lxc_deslashify() free memory

Make sure we always free any memory that was allocated by the call to
lxc_normalize_path().

Signed-off-by: Christian Brauner <48455ab3070520a2d174545c7239d6d0fabd9a83@canonical.com>

hfuCN/lxc,terceiro/lxc,ysbnim/lxc,aeris/lxc,caglar10ur/lxc,caglar10ur/lxc,hallyn/lxc,GreatFruitOmsk/lxc,federicobriata/lxc,ysbnim/lxc,cjwatson/lxc,federicobriata/lxc,terceiro/lxc,aeris/lxc,GreatFruitOmsk/lxc,hfuCN/lxc,thmo/lxc,caglar10ur/lxc,hallyn/lxc,aeris/lxc,ss1h2a3tw/lxc,GreatFruitOmsk/lxc,cjwatson/lxc,federicobriata/lxc,LynxChaus/lxc,cjwatson/lxc,hallyn/lxc,ysbnim/lxc,thmo/lxc,LynxChaus/lxc,thmo/lxc,ss1h2a3tw/lxc,terceiro/lxc,hfuCN/lxc,LynxChaus/lxc,ss1h2a3tw/lxc