sunrpc: destroy rpc_inode_cachep after unregister_filesystem

Better to unregister the file system before destroying the kmem_cache
cache of the inodes, so that the inodes are freed before we are trying
to destroy it. Otherwise, kmem_cache yells that some objects are live.
Signed-off-by: Dan Aloni <dan@kernelim.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

net/sunrpc/rpc_pipe.c

@@ -1510,6 +1510,6 @@ int register_rpc_pipefs(void)
 void unregister_rpc_pipefs(void)
 {
 	rpc_clients_notifier_unregister();
-	kmem_cache_destroy(rpc_inode_cachep);
 	unregister_filesystem(&rpc_pipe_fs_type);
+	kmem_cache_destroy(rpc_inode_cachep);
 }