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

hulk inclusion
category: bugfix
bugzilla: 31369

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This reverts commit ec02feff.
Following patche mainline has fixed this issue:
0188b878 ("kretprobe: Avoid re-registration of the same kretprobe earlier")

Signed-off-by: Wang ShaoBo <bobo.shaobowang@huawei.com>
Reviewed-by: Jian Cheng <cj.chengjian@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>