Description: perf: Fix check before add_event_to_groups() in perf_group_detach()
References:
 https://kernel.dance/fd0815f632c24878e325821943edccc7fde947a2
Notes:
 carnil> Commit fixes 2e498d0a74e5 ("perf: Add support for event removal
 carnil> on exec") in 5.13-rc1.
Bugs:
upstream: released (6.3-rc3) [fd0815f632c24878e325821943edccc7fde947a2]
6.1-upstream-stable: released (6.1.21) [529546ea2834ce58aa075837d57918740accf713]
5.10-upstream-stable: N/A "Vulnerable code not present"
4.19-upstream-stable: N/A "Vulnerable code not present"
sid: released (6.1.25-1)
5.10-bullseye-security: N/A "Vulnerable code not present"
4.19-buster-security: N/A "Vulnerable code not present"