Revert "kretprobe: check re-registration of the same kretprobe earlier"

hulk inclusion
category: bugfix
bugzilla: 31369
CVE: NA

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This reverts commit bd1ed1b7.
Following patches mainline has fixed this issue:
0188b878 ("kretprobe: Avoid re-registration of the same kretprobe earlier")
33b1d146 ("kprobes: Warn if the kprobe is reregistered")

Signed-off-by: Wang ShaoBo <bobo.shaobowang@huawei.com>
Reviewed-by: Cheng Jian <cj.chengjian@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>