Removed unused variable and changed comments about `permalink` decorator into a docstring.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@5719 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/models/__init__.py

@@ -15,14 +15,18 @@ from django.utils.text import capfirst
 # Admin stages.
 ADD, CHANGE, BOTH = 1, 2, 3
 
-# Decorator. Takes a function that returns a tuple in this format:
-#     (viewname, viewargs, viewkwargs)
-# Returns a function that calls urlresolvers.reverse() on that data, to return
-# the URL for those parameters.
 def permalink(func):
+    """
+    Decorator that calls urlresolvers.reverse() to return a URL using
+    parameters returned by the decorated function "func".
+
+    "func" should be a function that returns a tuple in one of the
+    following formats:
+        (viewname, viewargs)
+        (viewname, viewargs, viewkwargs)
+    """
     from django.core.urlresolvers import reverse
     def inner(*args, **kwargs):
         bits = func(*args, **kwargs)
-        viewname = bits[0]
         return reverse(bits[0], None, *bits[1:3])
     return inner