qemu: fix semantic error to fetch a specified virtual nic


git-svn-id: https://svn.apache.org/repos/asf/incubator/tashi/branches/stroucki-tashi11@1294415 13f79535-47bb-0310-9956-ffa450edef68
tree: a0249ce6c2c39b8e99601e879d71dd449b692984
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