[PATCH] Don't inherit ->splice_pipe across forks

It's really task private, so clear that field on fork after copying
task structure.
Signed-off-by: NJens Axboe <axboe@suse.de>

kernel/fork.c

@@ -180,6 +180,7 @@ static struct task_struct *dup_task_struct(struct task_struct *orig)
 	atomic_set(&tsk->usage,2);
 	atomic_set(&tsk->fs_excl, 0);
 	tsk->btrace_seq = 0;
+	tsk->splice_pipe = NULL;
 	return tsk;
 }