Fix the potential overflow in expression 1 << begin by using 1ULL.
Coverity issue: 279437, 279445
Fixes: c73a9071877a ("app/testpmd: add commands to test new offload API")
Cc: stable@dpdk.org
Signed-off-by: Tiwei Bie <tiwei.bie@intel.com>
Acked-by: Bernard Iremonger <bernard.iremonger@intel.com>