fix scm_iconv local variable name (#12228)

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@10741 e93f8b46-1217-0410-a6f0-8f06a7374b81

lib/redmine/scm/adapters/abstract_adapter.rb

@@ -264,7 +264,7 @@ module Redmine
             str.force_encoding(from)
             begin
               s = str.encode(to)
-            rescue Exception => e
+            rescue Exception => err
               logger.error("failed to convert from #{from} to #{to}. #{err}")
               nil
             end