v8: fix missing callback in heap utils destroy

This fixes the v8.getHeapSnapshot() calls not properly being
destroyed. Pipeline calls would for example not properly end
without the callback being in place.

Author: BridgeAR

lib/internal/heap_utils.js

@@ -53,11 +53,12 @@ class HeapSnapshotStream extends Readable {
       this[kHandle].readStart();
   }
 
-  _destroy() {
+  _destroy(err, callback) {
     // Release the references on the handle so that
     // it can be garbage collected.
     this[kHandle][owner_symbol] = undefined;
     this[kHandle] = undefined;
+    callback(err);
   }
 
   [kUpdateTimer]() {

test/sequential/test-heapdump.js

@@ -10,6 +10,7 @@ if (!isMainThread) {
 const { writeHeapSnapshot, getHeapSnapshot } = require('v8');
 const assert = require('assert');
 const fs = require('fs');
+const { promises: { pipeline }, PassThrough } = require('stream');
 const tmpdir = require('../common/tmpdir');
 
 tmpdir.refresh();
@@ -78,3 +79,15 @@ process.chdir(tmpdir.path);
     JSON.parse(data);
   }));
 }
+
+{
+  const passthrough = new PassThrough();
+  passthrough.on('data', common.mustCallAtLeast(()=> {
+    // Do nothing, just consume the data
+  }, 1));
+
+  pipeline(
+    getHeapSnapshot(),
+    passthrough,
+  ).then(common.mustCall());
+}