http: avoid closing index-pack input twice

finish_http_pack_request() passes its staging-file descriptor to
index-pack through child_process.in. start_command() takes ownership
of a supplied descriptor and closes it, even when starting the child
fails.

Do not close the descriptor again after run_command() returns.

Signed-off-by: Ted Nyman <tnyman@openai.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

http.c

@@ -2704,13 +2704,8 @@ int finish_http_pack_request(struct http_pack_request *preq)
 	else
 		ip.no_stdout = 1;
 
-	if (run_command(&ip)) {
+	if (run_command(&ip))
 		ret = -1;
-		goto cleanup;
-	}
-
-cleanup:
-	close(tmpfile_fd);
 	unlink(preq->tmpfile.buf);
 	return ret;
 }