net/i40e: fix incorrect packet index reference
net/i40e: fix incorrect packet index reference

Fixes: ae0eb310f253 ("net/i40e: implement vector PMD for ARM")
Cc: stable@dpdk.org

Signed-off-by: Jerin Jacob <5bca7d2a432bc0f5422b70b2701a4e4fa32edd00@caviumnetworks.com>
Signed-off-by: Sunil Kulkarni <9cdc75f825f421df08a3989829c5f674f029bb84@caviumnetworks.com>
Acked-by: Jianbo Liu <ad48e27d4475ec2c10ba93ba465af79f05639344@linaro.org>

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