Function create_mp_ring_vdev() for failure cases exits without
freeing the created rte rings, because of this, pdump tool cannot be
rerun successfully. Added rte ring cleanup logic upon failures.
Fixes: caa7028276b8 ("app/pdump: add tool for packet capturing")
Signed-off-by: Reshma Pattan <reshma.pattan@intel.com>
Acked-by: Ferruh Yigit <ferruh.yigit@intel.com>