kpatch_process: fix possible double free.
ptrace: fix NULL pointer access problem
fix patched process crashing when acccess the global var
fix probably restore cc symbol link fail when kill patch building uncourteous
optimize: Remove unnecessary comparison code
Signed-off-by: yezengruan <yezengruan@huawei.com>
(cherry picked from commit f3d59711105eb667fa2f920958fcbdbb7068afd2)
