http: release strbuf on disabled alternates

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

Fixes: abcbdc0 ("http: respect protocol.*.allow=user for http-alternates")
Signed-off-by: Eric Wong <[email protected]>
Reviewed-by: Jeff King <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: Eric Wong

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);
 				}
 			}
 		}