net/ixgbe: fix RSS flow error return
net/ixgbe: fix RSS flow error return

If hash function is 0, it should disable RSS then return 0.

Fixes: 518cc3927b13 ("net/ixgbe: move RSS to flow API")
Cc: stable@dpdk.org

Signed-off-by: Wei Zhao <55941fd0e75edbdf274af2cfac8f147525678f08@intel.com>
Tested-by: Yuan Peng <8f7613f20c127e29e1ae4d11e8d64be87217a51b@intel.com>
Acked-by: Qi Zhang <9e9e58ffa71a29bb7b87766b362515be648fcbe0@intel.com>

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