repl: fix /dev/null history file regression

This fixes a regression from 83887f35fa where ftruncate() fails on
a file symlinked to /dev/null.

PR-URL: https://github.com/nodejs/node/pull/12762
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Bartosz Sosnowski <bartosz@janeasystems.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

lib/internal/repl.js

@@ -173,14 +173,6 @@ function setupHistory(repl, historyPath, oldHistoryPath, ready) {
       return ready(err);
     }
     fs.ftruncate(hnd, 0, (err) => {
-      return onftruncate(err, hnd);
-    });
-  }
-
-  function onftruncate(err, hnd) {
-    if (err) {
-      return ready(err);
-    }
       repl._historyHandle = hnd;
       repl.on('line', online);
 
@@ -190,6 +182,7 @@ function setupHistory(repl, historyPath, oldHistoryPath, ready) {
         ready(null, repl);
       });
       flushHistory();
+    });
   }
 
   // ------ history listeners ------

test/parallel/test-repl-persistent-history.js

@@ -78,6 +78,8 @@ const emptyHistoryPath = path.join(fixtures, '.empty-repl-history-file');
 const defaultHistoryPath = path.join(common.tmpDir, '.node_repl_history');
 const emptyHiddenHistoryPath = path.join(fixtures,
                                          '.empty-hidden-repl-history-file');
+const devNullHistoryPath = path.join(common.tmpDir,
+                                     '.dev-null-repl-history-file');
 
 const tests = [
   {
@@ -178,6 +180,15 @@ const tests = [
     test: [UP],
     expected: [prompt]
   },
+  {
+    before: function before() {
+      if (!common.isWindows)
+        fs.symlinkSync('/dev/null', devNullHistoryPath);
+    },
+    env: { NODE_REPL_HISTORY: devNullHistoryPath },
+    test: [UP],
+    expected: [prompt]
+  },
   { // Make sure this is always the last test, since we change os.homedir()
     before: function before() {
       // Mock os.homedir() failure