[PATCH] nmclan_cs: dereferencing skb after netif_rx()

From: Florin Malita <fmalita@gmail.com>

The skb may be gone after netif_rx(), we can't use 'skb->len' to update the
stats.  'pkt_len' should work instead.

Coverity CID: 911.

Signed-off-by: Florin Malita <fmalita@gmail.com>
Cc: Dominik Brodowski <linux@dominikbrodowski.net>
Acked-by: Jeff Garzik <jeff@garzik.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>