fix: skip error return on then callback

Otherwise any succesful return would make the program think it failed

Author: imatlopez

lib/install.js

@@ -366,7 +366,7 @@ async function readCAFile (filename) {
 }
 
 module.exports = function (gyp, argv, callback) {
-  install(fs, gyp, argv).then(callback, callback)
+  install(fs, gyp, argv).then(callback.bind(undefined, null), callback)
 }
 module.exports.test = {
   download,