Use blob local instead of instance.

app/views/projects/blob/_blob.html.haml

@@ -16,7 +16,7 @@
         = link_to title, '#'
 %ul.blob-commit-info.bs-callout.bs-callout-info.hidden-xs
-  - blob_commit = @repository.last_commit_for_path(@commit.id, @blob.path)
+  - blob_commit = @repository.last_commit_for_path(@commit.id, blob.path)
   = render blob_commit, project: @project
 %div#tree-content-holder.tree-content-holder