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-rw-r--r--gpsd.h-tail2
1 files changed, 1 insertions, 1 deletions
diff --git a/gpsd.h-tail b/gpsd.h-tail
index 11ae76c6..a443a0b7 100644
--- a/gpsd.h-tail
+++ b/gpsd.h-tail
@@ -154,7 +154,7 @@ extern void isgps_output_magnavox(const isgps30bits_t *, unsigned int, FILE *);
extern enum isgpsstat_t rtcm2_decode(struct gps_packet_t *, unsigned int);
extern void rtcm2_sager_dump(const struct rtcm2_t *, /*@out@*/char[], size_t);
extern void json_rtcm2_dump(const struct rtcm2_t *,
- const char *, /*@out@*/char[], size_t);
+ /*@null@*/const char *, /*@out@*/char[], size_t);
extern int rtcm2_undump(/*@out@*/struct rtcm2_t *, char *);
extern void rtcm2_unpack(/*@out@*/struct rtcm2_t *, char *);
extern void rtcm3_unpack(/*@out@*/struct rtcm3_t *, char *);