[PATCH] PCI/MSI: pci-xgene-msi: Fix CPU hotplug registration handling

[Sebastian Andrzej Siewior]

On 2017-01-11 10:26:47 [+0000], Marc Zyngier wrote:
> The conversion to the new hotplug state machine introduced a regression
> where a successful hotplug registration would be treated as an error,
> effectively disabling the MSI driver forever.
> 
> Fix it by doing the proper check on the return value.
> 
> Fixes: 9c248f8896e6 ("PCI/xgene-msi: Convert to hotplug state machine")
Acked-by: Sebastian Andrzej Siewior <bigeasy at linutronix.de>

Sebastian