korina: add error-handling to korina_alloc_ring
This also avoids a potential buffer overflow in case the very first receive descriptor fails to allocate, as an index of -1 would be used afterwards. Kudos to Roel Kluin for pointing this out and providing an initial patch. Signed-off-by: NPhil Sutter <n0-1@freewrt.org> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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