ixgbe: prefetch cacheline after pointer becomes valid
ixgbe: prefetch cacheline after pointer becomes valid

At the original point the rx_pkts[pos( + n)] pointers are not initialized,
so the code is prefetching random data.

Signed-off-by: Zoltan Kiss <045352d2c5c4a454a2aefff6fa815639b332fd1d@linaro.org>
Acked-by: Bruce Richardson <66b9e8e8fbd5e9f41f91b0af050876182ce9d0e4@intel.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk