net/pcap: fix file descriptor leak on close
net/pcap: fix file descriptor leak on close

pcap fd was opend when vdev probed,
but not closed when vdev removed.

Fixes: c956caa6eabf ("pcap: support port hotplug")
Cc: stable@dpdk.org

Signed-off-by: Tengfei Zhang <0773cc1b704cdec668a0fb8343b0ddec34e1be36@outlook.com>
Acked-by: Ferruh Yigit <ba8734c3c506d2e3557bd4ac8fdaccd25bdb9aa7@intel.com>

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