qnx6: don't bother with ->i_dentry in inode-freeing callback

we'll initialize it in inode_init_always() when we allocate that
object again.
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

fs/qnx6/inode.c

@@ -622,7 +622,6 @@ static struct inode *qnx6_alloc_inode(struct super_block *sb)
 static void qnx6_i_callback(struct rcu_head *head)
 {
 	struct inode *inode = container_of(head, struct inode, i_rcu);
-	INIT_LIST_HEAD(&inode->i_dentry);
 	kmem_cache_free(qnx6_inode_cachep, QNX6_I(inode));
 }