fixup! http2: allow passing FileHandle to respondWithFD

Author: addaleax

lib/internal/http2/core.js

@@ -2524,13 +2524,10 @@ class ServerHttp2Stream extends Http2Stream {
       this[kState].flags |= STREAM_FLAGS_HAS_TRAILERS;
     }
 
-    if (typeof fd !== 'number' &&
-        !(fd instanceof fsPromisesInternal.FileHandle)) {
-      throw new ERR_INVALID_ARG_TYPE('fd', ['number', 'FileHandle'], fd);
-    }
-
-    if (typeof fd !== 'number')  // FileHandle
+    if (fd instanceof fsPromisesInternal.FileHandle)
       fd = fd.fd;
+    else if (typeof fd !== 'number')
+      throw new ERR_INVALID_ARG_TYPE('fd', ['number', 'FileHandle'], fd);
 
     debugStreamObj(this, 'initiating response from fd');
     this[kUpdateTimer]();

test/parallel/test-http2-respond-file-filehandle.js

@@ -25,7 +25,7 @@ fs.promises.open(fname, 'r').then(common.mustCall((fileHandle) => {
     });
   });
   server.on('close', common.mustCall(() => fileHandle.close()));
-  server.listen(0, () => {
+  server.listen(0, common.mustCall(() => {
 
     const client = http2.connect(`http://localhost:${server.address().port}`);
     const req = client.request();
@@ -43,5 +43,5 @@ fs.promises.open(fname, 'r').then(common.mustCall((fileHandle) => {
       server.close();
     }));
     req.end();
-  });
+  }));
 }));