net/af_packet: fix stale sockets

net/af_packet: fix stale sockets

af_packet driver is leaving stale socket after device is removed.

Ring buffers are memory mapped when device is added using rte_dev_probe.
There is no corresponding munmap call when device is removed/closed.

This commit fixes the issue by calling munmap
from rte_pmd_af_packet_remove().

Bugzilla ID: 339
Fixes: e6ee4db01b4d ("af_packet: make the device detachable")
Cc: stable@dpdk.org
Signed-off-by: Abhishek Sachan <abhishek.sachan@altran.com>
Reviewed-by: John W. Linville <linville@tuxdriver.com>