drivers/perf: hisi_pcie: Initialize event->cpu only on success

maillist inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8BOML
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/will/linux.git/commit/?h=for-next/perf&id=868f8a709874729998bcad3422124b678b18b755



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Initialize the event->cpu only on success. To be more reasonable
and keep consistent with other PMUs.

Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
Link: https://lore.kernel.org/r/20231024092954.42297-3-yangyicong@huawei.com


Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Junhao He <hejunhao3@huawei.com>