a77081e30f84bac7ce627d1a760ee6dc6db4354c
Let's compare the ifname passed in with what is set already if there is something set already. Complain in that case. This makes commands such as "resolvectl -i foo dns bar" less weird, as we'll refuse the duplicate ifname specifications. Also, free the old arg_ifname right before assigning the new, instead of doing so in advance.
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