cxl: fix sparse warnings

[Michael Ellerman]

On Fri, 2016-22-07 at 09:01:36 UTC, Andrew Donnellan wrote:
> Make native_irq_wait() static and use NULL rather than 0 to initialise
> phb->cfg_data in cxl_pci_vphb_add() to remove sparse warnings.
> 
> Signed-off-by: Andrew Donnellan <andrew.donnellan at au1.ibm.com>
> Reviewed-by: Matthew R. Ochs <mrochs at linux.vnet.ibm.com>
> Acked-by: Ian Munsie <imunsie at au1.ibm.com>

Applied to powerpc fixes, thanks.

https://git.kernel.org/powerpc/c/6fd40f192a9dba391b2d84882f

cheers