class_create() and class_device_create() return error code as a pointer on
failure.  These return values need to be checked by IS_ERR().
Signed-off-by: NAkinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NDave Airlie <airlied@linux.ie>