http: release strbuf on disabled alternates

This likely has no real-world impact on memory usage,
but it is cleaner for future readers.

Fixes: abcbdc03895f ("http: respect protocol.*.allow=user for http-alternates")
Signed-off-by: Eric Wong <e@80x24.org>
Reviewed-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

http-walker.c

@@ -319,6 +319,8 @@ static void process_alternates_response(void *callback_data)
 					while (tail->next != NULL)
 						tail = tail->next;
 					tail->next = newalt;
+				} else {
+					strbuf_release(&target);
 				}
 			}
 		}