perf: Move security_perf_event_free() call to __free_event()

Move the freeing of any security state associated with a perf event from
_free_event() to __free_event(), i.e. invoke security_perf_event_free() in
the error paths for perf_event_alloc().  This will allow adding potential
error paths in perf_event_alloc() that can occur after allocating security
state.

Note, kfree() and thus security_perf_event_free() is a nop if
event->security is NULL, i.e. calling security_perf_event_free() even if
security_perf_event_alloc() fails or is never reached is functionality ok.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Xudong Hao <xudong.hao@intel.com>
Link: https://patch.msgid.link/20251206001720.468579-4-seanjc@google.com

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