api/cluster: Fixes missing return on SmartError
api/cluster: Fixes missing return on SmartError

Suggested-by: Stéphane Graber <089afc6d81f66f1168a9849e15660feae286e024@ubuntu.com>
Signed-off-by: Thomas Parrott <6b778ce645fb0e3dde76d79eccad490955b1ae74@canonical.com>

mjeanson/lxd,stgraber/lxd,lxc/lxd,mjeanson/lxd,stgraber/lxd,hallyn/lxd,atxwebs/lxd,Skarlso/lxd,hallyn/lxd,lxc/lxd,stgraber/lxd,Skarlso/lxd,atxwebs/lxd,stgraber/lxd,stgraber/lxd,atxwebs/lxd,hallyn/lxd,Skarlso/lxd,lxc/lxd,lxc/lxd,hallyn/lxd,lxc/lxd,Skarlso/lxd,stgraber/lxd,lxc/lxd,lxc/lxd,hallyn/lxd,mjeanson/lxd,stgraber/lxd,atxwebs/lxd,hallyn/lxd