system call failure should be tested against -1, rather than "< 0"

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers.c b/drivers.c
index 04532ece..c98bd8b9 100644
--- a/drivers.c
+++ b/drivers.c
@@ -663,7 +663,7 @@ static int tnt_packet_sniff(struct gps_device_t *session)
     {
       count = 0;
       (void)tnt_send(session->gpsdata.gps_fd, "@X?");
-      if (ioctl(session->gpsdata.gps_fd, FIONREAD, &count) < 0)
+      if (ioctl(session->gpsdata.gps_fd, FIONREAD, &count) == -1)
 	  return BAD_PACKET;
       if (count == 0) {
 	  //int delay = 10000000000.0 / session->gpsdata.baudrate;