To clean alloc_q, which has physical addresses of the mbufs, kni lib
free the pkt_mempool, but this leads a crash in kni unit test.
KNI library shouldn't free the pkt_mempool.
Implementation updated to find the mbufs in the alloc_q and return them
back to mempool.
Fixes: 8eba5ebd1811 ("kni: fix possible memory leak")
Cc: stable@dpdk.org
Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>
57a484e08a