ptrace: Remove second setting of PT_SEIZED in ptrace_attach

The code is totally redundant remove it.

Link: https://lkml.kernel.org/r/20220103213312.9144-6-ebiederm@xmission.com
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

kernel/ptrace.c

@@ -419,8 +419,6 @@ static int ptrace_attach(struct task_struct *task, long request,
 	if (task->ptrace)
 		goto unlock_tasklist;
 
-	if (seize)
-		flags |= PT_SEIZED;
 	task->ptrace = flags;
 
 	ptrace_link(task, current);