net/vde: print error on vde_open() failure
Despite the fact that now when the initialization of vde fails, qemu does not end silently, no informative error is printed. The patch generates an error and pushes it through the calling function. Related bug: https://bugs.launchpad.net/qemu/+bug/676029Signed-off-by: NJulia Suvorova <jusual@mail.ru> Signed-off-by: NJason Wang <jasowang@redhat.com>
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