fix: make ping not mix errors with responses (#883)

* fix: make ping not mix errors with responses

* chore: update interface-ipfs-core

* chore: update interface-ipfs-core

Author: daviddias

Diff for: package.json

@@ -85,7 +85,7 @@
     "eslint-plugin-react": "^7.11.1",
     "go-ipfs-dep": "~0.4.17",
     "gulp": "^3.9.1",
-    "interface-ipfs-core": "~0.83.0",
+    "interface-ipfs-core": "~0.84.2",
     "ipfsd-ctl": "~0.39.5",
     "pull-stream": "^3.6.9",
     "stream-equal": "^1.1.1"

Diff for: src/ping.js

@@ -46,7 +46,12 @@ module.exports = (arg) => {
             cb()
           }
         }),
-        (err) => callback(err, responses)
+        (err) => {
+          if (err) {
+            return callback(err)
+          }
+          callback(null, responses)
+        }
       )
     }