node-gyp: fix lint

Author: TooTallNate

lib/node-gyp.js

@@ -40,7 +40,7 @@ log.heading = 'gyp'
  */
 
 function gyp () {
-  return new Gyp
+  return new Gyp()
 }
 
 function Gyp () {
@@ -130,7 +130,7 @@ proto.parseArgv = function parseOpts (argv) {
   var commands = this.todo = []
 
   // create a copy of the argv array with aliases mapped
-  var argv = this.argv.map(function (arg) {
+  argv = this.argv.map(function (arg) {
     // is this an alias?
     if (arg in this.aliases) {
       arg = this.aliases[arg]
@@ -178,7 +178,7 @@ proto.parseArgv = function parseOpts (argv) {
  */
 
 proto.spawn = function spawn (command, args, opts) {
-  opts || (opts = {})
+  if (!opts) opts = {}
   if (!opts.silent && !opts.customFds) {
     opts.customFds = [ 0, 1, 2 ]
   }
@@ -193,7 +193,7 @@ proto.spawn = function spawn (command, args, opts) {
  */
 
 proto.usage = function usage () {
-  var usage = [
+  var str = [
       ''
     , '  Usage: node-gyp <command> [options]'
     , ''
@@ -208,7 +208,7 @@ proto.usage = function usage () {
     , 'node-gyp@' + this.version + '  ' + path.resolve(__dirname, '..')
     , 'node@' + process.versions.node
   ].join('\n')
-  return usage
+  return str
 }
 
 /**