livepatch: Cleanup klp_mem_prepare()

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I5CJ7X



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When klp_mem_prepare() fails, the requested resources are not cleared.
We'd better clean up each newly requested resource upon error return.

Signed-off-by: Li Huafei <lihuafei1@huawei.com>
Reviewed-by: Xu Kuohai <xukuohai@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>