Add method that returns markdown in file uploader

app/uploaders/file_uploader.rb

@@ -32,6 +32,10 @@ class FileUploader < CarrierWave::Uploader::Base
     File.join("/uploads", @secret, file.filename)
   end
 
+  def to_markdown
+    to_h[:markdown]
+  end
+
   def to_h
     filename = image? ? self.file.basename : self.file.filename
     escaped_filename = filename.gsub("]", "\\]")

lib/gitlab/gfm/reference_rewriter.rb

@@ -46,7 +46,7 @@ module Gitlab
       end
 
       def needs_rewrite?
-        !(@text =~ @pattern).nil?
+        @text =~ @pattern
       end
 
       private

lib/gitlab/gfm/uploads_rewriter.rb

@@ -23,7 +23,7 @@ module Gitlab
           return markdown unless file.try(:exists?)
 
           new_uploader.store!(file)
-          new_uploader.to_h[:markdown]
+          new_uploader.to_markdown
         end
       end