network: Fix NULL dereference during error recovery
This fixes: https://bugzilla.redhat.com/show_bug.cgi?id=696660 While starting a network, if brSetForwardDelay() fails, we go to err1 where we want to access macTapIfName variable which was just VIR_FREE'd a few lines above. Instead, keep macTapIfName until we are certain of success.
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