embms: kw fixes for embms-kernel.

fixed Array 'skb->dev->name' of size 16 may use index value.
null check done for embms_device.name.

Change-Id: Ie09b5e23ded030f32ffcc8b6c7133773cb6872a4
Signed-off-by: Ravinder Konka <rkonka@codeaurora.org>