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When a system had no interface, this function used xmalloc for root but did not return any reference to it. This patch fixes it by immediately returning an empty array if no interface is found. Coverity Scan found this bug. git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43121 b2dd03c8-39d4-4d8f-98ff-823fe69b080e