cmd_tunnel_udp_config checked 'cmd' to set prot_type but this cmd is
only for rx_vxlan_port. The unnecessary cmd check will cause uninit
coverity issue. So remove it and rename 'cmd' to 'rx_vxlan_port'.
Coverity issue: 366155
Fixes: bd948f20d609 ("app/testpmd: VXLAN packet identification")
Cc: stable@dpdk.org
Signed-off-by: Xiaoyun Li <xiaoyun.li@intel.com>
Acked-by: Ferruh Yigit <ferruh.yigit@intel.com>