[PATCH] promisor-remote.h: fix an 'hdr-check' warning

[Ramsay Jones]

Signed-off-by: Ramsay Jones <ram...@ramsayjones.plus.com>
---

Hi Christian,

If you need to re-roll your 'cc/multi-promisor' branch, could you
please squash this into the relevant patch (commit e52d417b57
("promisor-remote: implement promisor_remote_get_direct()", 2019-04-01)).

[I had a deja-vu moment writing this - it seems I sent a very
similar mail about 3 weeks ago. ;-) ]

Thanks!

ATB,
Ramsay Jones

 promisor-remote.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/promisor-remote.h b/promisor-remote.h
index e29cf507ab..562c7ad8a4 100644
--- a/promisor-remote.h
+++ b/promisor-remote.h
@@ -1,6 +1,8 @@
 #ifndef PROMISOR_REMOTE_H
 #define PROMISOR_REMOTE_H
 
+struct object_id;
+
 /*
  * Promisor remote linked list
  *
-- 
2.21.0