Xen: Do not generate net ifname if domain is inactive
V2: Use virAsprintf instead of snprintf/strdup The xend driver will generate a virDomainNetDef ifname if one is not specified in xend sexpr, even if domain is inactive. The result is network interface XML containing 'vif-1.Y' on dev attribute of target element, e.g. <interface type='bridge'> <target dev='vif-1.0'/> ... This patch changes the behavior to only generate the ifname if not specified in xend sexpr *and* domain is not inactive (id != -1).
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