Description: af_unix: fix struct pid memory leak
References:
 https://bugzilla.redhat.com/show_bug.cgi?id=1908827
Notes:
Bugs:
upstream: released (4.5-rc3) [fa0dc04df259ba2df3ce1920e9690c7842f8fa4b]
5.10-upstream-stable: N/A "Fixed before branching point"
4.19-upstream-stable: N/A "Fixed before branching point"
4.9-upstream-stable: N/A "Fixed before branching point"
sid: released (4.4.4-1)
4.19-buster-security: N/A "Fixed before branching point"
4.9-stretch-security: N/A "Fixed before branching point"