ipg: use NULL, not zero, for pointers
Fixes a sparse warning in a code block that's hidden under JUMBO_FRAME #ifdef. Tested-by: NAndrew Savchenko <Bircoph@list.ru> Signed-off-by: NPekka Enberg <penberg@cs.helsinki.fi> Signed-off-by: NJeff Garzik <jgarzik@redhat.com>
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