Fix fd leak in http-fetch

Added a call to finish_request to clean up resources if the server
returned a 404 and there are no alternates left to try.

Signed-off-by: Nick Hengeveld <nickh@reactrix.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>

http-fetch.c

@@ -632,6 +632,8 @@ static void process_curl_messages(void)
 						request->repo =
 							request->repo->next;
 						start_request(request);
+					} else {
+						finish_request(request);
 					}
 				} else {
 					finish_request(request);