fix: traverse-ipld-graphs (tree) example (#2088)

Author: dirkmc

examples/traverse-ipld-graphs/put.js

@@ -20,6 +20,6 @@ createNode((err, ipfs) => {
     }
     console.log(cid.toBaseEncodedString())
     // should print:
-    //   zdpuAzZSktMhXjJu5zneSFrg9ue5rLXKAMC9KLigqhQ7Q7vRm
+    //   bafyreigsccjrxlioppkkzv27se4gxh2aygbxfnsobkaxxqiuni544uk66a
   })
 })

examples/traverse-ipld-graphs/tree.js

@@ -20,14 +20,14 @@ createNode((err, ipfs) => {
       let node
 
       try {
-        dagPB.DAGNode.create(someData)
+        node = dagPB.DAGNode.create(someData)
       } catch (err) {
         return cb(err)
       }
 
       ipfs.dag.put(node, { format: 'dag-pb', hashAlg: 'sha2-256' }, (err, cid) => {
         if (err) {
-          cb(err)
+          return cb(err)
         }
         cidPBNode = cid
         cb()
@@ -58,5 +58,7 @@ createNode((err, ipfs) => {
         console.log(paths)
       })
     }
-  ])
+  ], (err) => {
+    console.error('Error:', err)
+  })
 })