Merge branch 'jk/stop-pack-objects-when-push-is-killed'

"git push" that is killed may leave a pack-objects process behind,
still computing to find a good compression, wasting cycles.  This
has been corrected.

* jk/stop-pack-objects-when-push-is-killed:
  send-pack: kill pack-objects helper on signal or exit

Author: gitster

send-pack.c

@@ -85,6 +85,7 @@ static int pack_objects(int fd, struct ref *refs, struct oid_array *extra, struc
 	po.in = -1;
 	po.out = args->stateless_rpc ? -1 : fd;
 	po.git_cmd = 1;
+	po.clean_on_exit = 1;
 	if (start_command(&po))
 		die_errno("git pack-objects failed");