gps_json.h: Declare struct gps_device_t

It seems like gps.h is always included before gps_json.h, which is an
odd requirement but acceptable.  But it probably shouldn't require
including gpsd.h for one struct, so just declare gps_device_t here.

Signed-off-by: Gary E. Miller <gem@rellim.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/gps_json.h b/gps_json.h
index 9d97304c..2b19d809 100644
--- a/gps_json.h
+++ b/gps_json.h
@@ -13,6 +13,9 @@
 #ifdef __cplusplus
 extern "C" {
 #endif
+
+struct gps_device_t;
+
 void json_data_report(const gps_mask_t,
 		      const struct gps_device_t *,
 		      const struct policy_t *,