[RFC 4/6] hash: remove VLA warnings

[Morten Brørup]

> From: Konstantin Ananyev <konstantin.ananyev at huawei.com>
> 
> 1) ./lib/hash/rte_cuckoo_hash.c:2362:9: warning: ISO C90 forbids variable
> length array ‘positions’ [-Wvla]
> 2) ../lib/hash/rte_cuckoo_hash.c:2478:9: warning: ISO C90 forbids variable
> length array ‘positions’ [-Wvla]
> 
> Both rte_hash_lookup_bulk_data() and
> rte_hash_lookup_with_hash_bulk_data() expect
> @num_keys <= RTE_HASH_LOOKUP_BULK_MAX.
> So, for both cases it should be safe to replace VLA with fixed size
> array.
> 
> Signed-off-by: Konstantin Ananyev <konstantin.ananyev at huawei.com>
> ---

Acked-by: Morten Brørup <mb at smartsharesystems.com>