app/pdump: remove only created vdevs
app/pdump: remove only created vdevs

This commit fixes a bug in which a unidirectional pdump could attempt to
remove devices it didn't create.

Fixes: 35cb223ab7be ("app/pdump: fix vdev cleanup")
Cc: stable@dpdk.org

Signed-off-by: Gage Eads <40e74f4682b7928915cbf15b25c304eff85f59a4@intel.com>
Acked-by: Reshma Pattan <4d9eb35579760ed1c2db754a6b402039c9c8a1cb@intel.com>

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