fix(put-stream): use new promise API for moves

Author: zkat

Diff for: lib/content/put-stream.js

@@ -133,18 +133,10 @@ function moveToDestination (tmpTarget, cache, digest, opts, errCheck) {
 
   return fixOwner.mkdirfix(
     destDir, opts.uid, opts.gid
-  ).then(() => (
-    new Promise((resolve, reject) => {
-      errCheck()
-      moveFile(tmpTarget, destination, err => {
-        if (err) {
-          reject(err)
-        } else {
-          resolve()
-        }
-      })
-    })
-  )).then(() => {
+  ).then(() => {
+    errCheck()
+    return moveFile(tmpTarget, destination)
+  }).then(() => {
     errCheck()
     return fixOwner.chownr(destination, opts.uid, opts.gid)
   })