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a68fed111bnet: Fix misleading comment for Discover (laanwj)7766dd280dnet: Replace ifname check with IFF_LOOPBACK in Discover (laanwj) Pull request description: Checking the interface name is kind of brittle. In the age of network namespaces and containers, there is no reason a loopback interface can't be called differently. Check for the `IFF_LOOPBACK` flag to detect loopback interface instead. Also remove a misleading comment in Discover's doc comment. ACKs for top commit: sipa: utACKa68fed111bwillcl-ark: utACKa68fed111btheuni: utACKa68fed111b. Satoshi-era brittleness :) Tree-SHA512: e2d7fc541f40f6a6af08286e7bcb0873ff55debdcd8b38b03f274897b673a6fb51d84d6c7241a02a9567ddf2645f50231d91bb1f55307ba7c6e68196c29b0edf