[PATCH] mtd: spi-nor: use IS_ERR_OR_NULL as spi_nor_read_id returns ERR_PTR

[Brian Norris]

On Mon, Dec 01, 2014 at 11:37:24AM +0100, Rafał Miłecki wrote:
> Signed-off-by: Rafał Miłecki <zajec5 at gmail.com>
> ---
> Oh damn, I did wrong in my commit
> 5986a0d4717bc82af0e69e3c6dd04150eafceabe
> mtd: spi-nor: allow NULL as chip name and try to auto detect it
> 
> Glad we have Dan & kbuild watching us.

Squashed into the bad commit and pushed to l2-mtd.git. Thanks!