hash: make arg for jhash2 const
hash: make arg for jhash2 const

The argument to rte_jhash2() is not changed.

Signed-off-by: Stephen Hemminger <5939443bd6498ae9d7581c946dfbecf8ed1feac0@brocade.com>
Acked-by: Thomas Monjalon <ee2fa8b2681c737f775687e475dcbf2028a412f1@6wind.com>

phermansson/dpdk,phermansson/dpdk,phermansson/dpdk,phermansson/dpdk