Pass -f to curl when downloading a file with it, so it propigates failure.

Utility/Url.hs

@@ -116,7 +116,8 @@ download' quiet url headers options file =
 	 - the remainder to download as the whole file,
 	 - and not indicating how much percent was
 	 - downloaded before the resume. -}
-	curl = go "curl" $ headerparams ++ quietopt "-s" ++ [Params "-L -C - -# -o"]
+	curl = go "curl" $ headerparams ++ quietopt "-s" ++
+		[Params "-f -L -C - -# -o"]
 	go cmd opts = boolSystem cmd $
 		options++opts++[File file, File url]
 	quietopt s

debian/changelog

@@ -18,6 +18,7 @@ git-annex (4.20130628) UNRELEASED; urgency=low
   * addurl --pathdepth: Fix failure when the pathdepth specified is deeper
     than the urls's path.
   * Windows: Look for .exe extension when searching for a command in path.
+  * Pass -f to curl when downloading a file with it, so it propigates failure. 
 
  -- Joey Hess <joeyh@debian.org>  Tue, 02 Jul 2013 15:40:55 -0400