livepatch/core: Remove redundant klp_free_objects_mod_limited

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I4SFHQ



--------------------------------

Refer to following function procedure, klp_free_objects_mod_limited
seems redundant, so remove it:
  klp_register_patch
      klp_init_patch
          klp_init_object             <---
              klp_find_object_module      \
                  try_module_get           |<-- 1. If something wrong here
          jump_label_register         <----
          klp_free_objects_mod_limited    <-- 2. Check and put 'obj->mod'
              module_put
      klp_free_patch_start    <-- 3. Check and put 'obj->mod' again
          klp_free_objects
              __klp_free_objects
                  module_put

Signed-off-by: Zheng Yejian <zhengyejian1@huawei.com>
Reviewed-by: Xu Kuohai <xukuohai@huawei.com>
Reviewed-by: Cheng Jian <cj.chengjian@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>