cxl: Fix error handling

[Michael Ellerman]

On Sun, 2016-10-30 at 21:40:47 UTC, Christophe Jaillet wrote:
> 'cxl_dev_context_init()' returns an error pointer in case of error, not
> NULL. So test it with IS_ERR.
> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet at wanadoo.fr>
> Reviewed-by: Andrew Donnellan <andrew.donnellan at au1.ibm.com>
> Acked-by: Frederic Barrat <fbarrat at linux.vnet.ibm.com>
> Acked-by: Ian Munsie <imunsie at au1.ibm.com>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/bb81733de28c99e10b61dcaff15921

cheers