app/testpmd: fix uninitialized flow control variables
app/testpmd: fix uninitialized flow control variables

rx_fc_en and tx_fc_en in cmd_link_flow_ctrl_set_parsed
could be used without being initialized.

Signed-off-by: Pablo de Lara <28355d9cfe41bb8148aea0fb24f47aae8f4217a1@intel.com>

phermansson/dpdk,phermansson/dpdk,phermansson/dpdk,phermansson/dpdk