doebuild.py: remove unused f = None
diff --git a/pym/portage/package/ebuild/doebuild.py b/pym/portage/package/ebuild/doebuild.py
index b9952be..e7a8983 100644
--- a/pym/portage/package/ebuild/doebuild.py
+++ b/pym/portage/package/ebuild/doebuild.py
@@ -1786,7 +1786,6 @@
 		for i in xdg_dirs if i)
 
 	qa_desktop_file = ""
-	f = None
 	try:
 		with io.open(_unicode_encode(os.path.join(
 			mysettings["PORTAGE_BUILDDIR"],