[PATCH] json-writer: fix a 'hdr-check' warning

Signed-off-by: Ramsay Jones <redacted>
---

Hi Duy,

If you need to re-roll your 'nd/index-dump-in-json' branch, could
you please squash this into the relevant patch (commit 53f1666b3a,
'split-index.c: dump "link" extension as json', 2019-06-19).

Thanks!

ATB,
Ramsay Jones

 json-writer.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/json-writer.h b/json-writer.h
index f778e019a2..29d3dd91e0 100644
--- a/json-writer.h
+++ b/json-writer.h

@@ -45,6 +45,7 @@
 #include "strbuf.h"
 
 struct stat_data;
+struct ewah_bitmap;
 
 struct json_writer
 {

-- 
2.22.0