frameworks/base: ignore invalid handle in android_getaddrinfofornetwork

[NotKit]

Since we fallback to host systemd-resolved in bionic, specifying network ID doesn't make sense anyway and we can use NETID_UNSET.

[ElectrodeYT]

LGTM; although I do still wonder if simply replacing the entire function with something along the lines of return android_getaddrinfofornet(node, service, hints, NETID_UNSET, MARK_UNSET, res); would work as well? I don't know if this function will ever see a valid net handle, which would make the check needless

Would technically save a needless if statement, but I doubt that this gets called enough for that branch to be even close to wasting performance lol