Simplified implementation of collectstatic command.

Since d2e242d16c6dde6f4736086fb38057424bed3edb made isinstance()
calls work correctly on LazyObject, we can simplify the
implementation of is_local_storage added in
7e27885c6e.

django/contrib/staticfiles/management/commands/collectstatic.py

@@ -7,7 +7,6 @@ from optparse import make_option
 from django.core.files.storage import FileSystemStorage
 from django.core.management.base import CommandError, NoArgsCommand
 from django.utils.encoding import smart_text
-from django.utils.functional import LazyObject
 from django.utils.six.moves import input
 
 from django.contrib.staticfiles import finders, storage
@@ -193,11 +192,7 @@ class Command(NoArgsCommand):
             self.stdout.write(msg)
 
     def is_local_storage(self):
-        if issubclass(self.storage.__class__, LazyObject):
-            storage = self.storage._wrapped
-        else:
-            storage = self.storage
-        return isinstance(storage, FileSystemStorage)
+        return isinstance(self.storage, FileSystemStorage)
 
     def clear_dir(self, path):
         """

django/utils/functional.py

@@ -367,7 +367,7 @@ class SimpleLazyObject(LazyObject):
 
     def __deepcopy__(self, memo):
         if self._wrapped is empty:
-            # We have to use type(self), not self.__class__, because the
+            # We have to use SimpleLazyObject, not self.__class__, because the
             # latter is proxied.
             result = SimpleLazyObject(self._setupfunc)
             memo[id(self)] = result