Move push size check to EE module

# Conflicts:
#	ee/lib/ee/gitlab/git_access.rb
#	lib/gitlab/git_access.rb

lib/gitlab/git_access.rb

@@ -261,8 +261,6 @@ module Gitlab
         raise UnauthorizedError, ERROR_MESSAGES[:upload]
       end
 
-      return if changes.blank? # Allow access this is needed for EE.
-
       check_change_access!
     end