attribute_group are not supposed to change at runtime. All functions
working with attribute_group provided by <linux/netdevice.h> work
with const attribute_group. So mark the non-const structs as const.

File size before:
   text    data     bss     dec     hex filename
  13275     928       1   14204    377c drivers/net/usb/cdc_ncm.o

File size After adding 'const':
   text    data     bss     dec     hex filename
  13339     864       1   14204    377c drivers/net/usb/cdc_ncm.o

Signed-off-by: Arvind Yadav <arvind.yadav...@gmail.com>
---
Changes in v2:
              Added cover later.
Changes in v3:
              net-next was closed. Now resubmitting it.

 drivers/net/usb/cdc_ncm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c
index d103a1d..b401ba9 100644
--- a/drivers/net/usb/cdc_ncm.c
+++ b/drivers/net/usb/cdc_ncm.c
@@ -367,7 +367,7 @@ static DEVICE_ATTR(name, S_IRUGO, cdc_ncm_show_##name, NULL)
        NULL,
 };
 
-static struct attribute_group cdc_ncm_sysfs_attr_group = {
+static const struct attribute_group cdc_ncm_sysfs_attr_group = {
        .name = "cdc_ncm",
        .attrs = cdc_ncm_sysfs_attrs,
 };
-- 
1.9.1

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