drivers.c: fix pointer type to remove cc warning.

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers.c b/drivers.c
index 0256995b..fbef223c 100644
--- a/drivers.c
+++ b/drivers.c
@@ -1385,7 +1385,7 @@ static bool aivdm_decode(const char *buf, size_t buflen,
     unsigned char *field[NMEA_MAX*2];
     unsigned char fieldcopy[NMEA_MAX*2+1];
     unsigned char *data, *cp;
-    unsigned char const *cp1;
+    char const *cp1;
     int pad;
     struct aivdm_context_t *ais_context;
     int i;