Kill trailing whitespace in ruby files

app/helpers/posts_helper.rb

@@ -5,18 +5,18 @@ module PostsHelper
     if post.has_large?
       links << link_to("L", post.large_file_url, :id => "large-file-link")
     end
-    
+
     if post.has_large?
       links << link_to("O", post.file_url, :id => "original-file-link")
     end
-    
+
     if links.any?
       content_tag("span", raw("Resize: " + links.join(" ")))
     else
       nil
     end
   end
-  
+
   def post_source_tag(post)
     if post.source =~ /^http/
       text = truncate(post.normalized_source.sub(/^https?:\/\//, ""))