app/testpmd: fix unintentional integer overflow
app/testpmd: fix unintentional integer overflow

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 <f338cf29d7d69ff1bc99f755ebfb0eb0accd409e@intel.com>
Acked-by: Bernard Iremonger <233eeff376ad0c06f66f06c5522ea3c4feb30d3b@intel.com>

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