powerpc/nvram: Fix a memory leak in err path

[Michael Ellerman]

On Wed, 2015-09-12 at 10:00:53 UTC, xinhui wrote:
> If kmemdup fails, We need kfree *buff* first then return -ENOMEM.
> Otherwise there is a memory leak.
> 
> Signed-off-by: Pan Xinhui <xinhui.pan at linux.vnet.ibm.com>
> Reviewed-by: Nathan Fontenot <nfont at linux.vnet.ibm.com>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/0d0fecc5b5bfddb0e67bef985c

cheers