network: Fixes a little typo in an error message
network: Fixes a little typo in an error message

Signed-off-by: tomponline <6b778ce645fb0e3dde76d79eccad490955b1ae74@canonical.com>

ss1h2a3tw/lxc,ss1h2a3tw/lxc,ss1h2a3tw/lxc,hallyn/lxc,hallyn/lxc,hallyn/lxc