Title: #5297: Fix IP network by address lookup
The first commit fixes the error path when an IP host is not found in the proxy provider.
A memory allocation error was logged because we didn't jump to done label after
[be[test]] [proxy_save_host] (0x0040): Cannot get cased name.
[be[test]] [get_host_byname] (0x0040): Failed to store host [(null)] : Cannot allocate
To pull the PR as Git branch:
git remote add ghsssd https://github.com/SSSD/sssd
git fetch ghsssd pull/5297/head:pr5297
git checkout pr5297