daemon: release endpoint lock if PinDatapathMap fails
daemon: release endpoint lock if PinDatapathMap fails

\`daemon.deleteEndpoint\` assumes the endpoint lock is not held when
it is called.

Fixes: b277ab4d56 ("endpoint: Refactor ipvlan related method names")

Signed-off by: Ian Vernon <ian@cilium.io>

tgraf/cilium,tklauser/cilium,tgraf/cilium,cilium/cilium,michi-covalent/cilium,tklauser/cilium,michi-covalent/cilium,cilium/cilium,tklauser/cilium,tgraf/cilium,michi-covalent/cilium,tgraf/cilium,tgraf/cilium,tklauser/cilium,cilium-team/cilium,cilium/cilium,cilium/cilium,cilium-team/cilium,tklauser/cilium,cilium/cilium,michi-covalent/cilium,tgraf/cilium,michi-covalent/cilium