rerere: remove an null statement

J6t spotted that previous commit added an empty statement by
mistake.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

rerere.c

@@ -1074,7 +1074,7 @@ static int rerere_forget_one_path(const char *path, struct string_list *rr)
 		else
 			error("cannot unlink %s: %s", filename, strerror(errno));
 		goto fail_exit;
-	};
+	}
 
 	/*
 	 * Update the preimage so that the user can resolve the