[libvirt] [PATCH] networkStartNetworkVirtual: Don't overwrite error in 'err5'

[Peter Krempa]

On Tue, Apr 23, 2019 at 16:21:49 +0200, Michal Privoznik wrote:
> If there's an error when setting up QoS on a bridge the control
> jumps over to 'err5' label. Here, the virNetDevBandwidthClear()
> is called to clear out any partially set QoS. This function can
> also report an error which would overwrite the actual error that
> caused us jumping here. 🤦 Use virErrorPreserveLast() to preserve

NACK
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