aufs: for v5.3-rc1, permanent rwsem->owner

By the commit,
	c71fd893f614 2019-06-17 locking/rwsem: Make owner available even
		if !CONFIG_RWSEM_SPIN_ON_OWNER
rwsem->owner is always defined regardless CONFIG_RWSEM_SPIN_ON_OWNER.
Aufs simply follows it.

fs/aufs/i_op.c

@@ -627,9 +627,7 @@ out:
 
 static void au_pin_hdir_set_owner(struct au_pin *p, struct task_struct *task)
 {
-#if !defined(CONFIG_RWSEM_GENERIC_SPINLOCK) && defined(CONFIG_RWSEM_SPIN_ON_OWNER)
-	p->hdir->hi_inode->i_rwsem.owner = task;
-#endif
+	atomic_long_set(&p->hdir->hi_inode->i_rwsem.owner, (long)task);
 }
 
 void au_pin_hdir_acquire_nest(struct au_pin *p)