otutil: Note that ot_log_structured takes a printf format

This notably fixes compilation with CLang.

Closes: #548
Approved by: jlebon

diff --git a/src/libotutil/ot-log-utils.h b/src/libotutil/ot-log-utils.h
index 5e0502ab5509c27d796c70d5fe6c78171b4c6e0b..8d9786de9f1815a868c4ddb9a3b2692c2fd3e41b 100644 (file)
--- a/src/libotutil/ot-log-utils.h
+++ b/src/libotutil/ot-log-utils.h
@@ -26,6 +26,6 @@ G_BEGIN_DECLS
 
 void ot_log_structured_print_id_v (const char *message_id,
                                    const char *format,
-                                   ...);
+                                   ...) G_GNUC_PRINTF(2, 3);
 
 G_END_DECLS