sfc: Match calls to netif_napi_add() and netif_napi_del()

sfc: Match calls to netif_napi_add() and netif_napi_del()

upstream commit: 718cff1eec595ce6ab0635b8160a51ee37d9268d

sfc could call netif_napi_add() multiple times for the same
napi_struct, corrupting the list of napi_structs for the associated
device and leading to a busy-loop on device removal.  Move the call to
netif_napi_add() and add a call to netif_napi_del() in the obvious
places.

[bhutchings: backport to 2.6.29]
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>