app/testpmd: fix Tx retry in flowgen engine
app/testpmd: fix Tx retry in flowgen engine

Fix tx_pkt number in tx retry logic.

Fixes: bf56fce1fb45 ("app/testpmd: add retry option")
Cc: stable@dpdk.org

Signed-off-by: Zhihong Wang <d340c26e7e7f43270f08407698de08b85b54ac43@bytedance.com>
Acked-by: Xiaoyun Li <151cc00bdba86cfa2ecfc39aaa98def8f092d9d8@intel.com>

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