minor change to pbxFile
diff --git a/lib/pbxFile.js b/lib/pbxFile.js
index 0215bc3..cdfda54 100644
--- a/lib/pbxFile.js
+++ b/lib/pbxFile.js
@@ -164,9 +164,8 @@
 }
 
 function pbxFile(filepath, opt) {
-    var opt = opt || {};
-
-    self = this;
+    var opt = opt || {},
+        self = this;
 
     this.basename = path.basename(filepath);
     this.lastKnownFileType = opt.lastKnownFileType || detectType(filepath);