Revert "RPC: stops the release_pipe() funtion from being called twice"

This reverts 747c5534c9a6da4aa87e7cdc2209ea98ea27f381 commit.
diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c
index 649d609..ded6c63 100644
--- a/net/sunrpc/rpc_pipe.c
+++ b/net/sunrpc/rpc_pipe.c
@@ -177,8 +177,6 @@
 		__rpc_purge_upcall(inode, -EPIPE);
 	if (rpci->ops->release_pipe)
 		rpci->ops->release_pipe(inode);
-	if (!rpci->nreaders && !rpci->nwriters)
-		rpci->ops = NULL;
 out:
 	up(&inode->i_sem);
 	return 0;