Address Savannah bug #44566: Unused variable warnings with -DNDEBUG

With -Werror -DNDEBUG, these two cases end up failing with unused variables
(gcc 4.9 with lots of patches on Linux).  The attached patch solves the issue
for me, but it's possible that it might be better with the UNUSEDs wrapped in

1 files changed, 1 insertions, 1 deletions

diff --git a/gpsmon.c b/gpsmon.c
index bee05b83..4cb3b2db 100644
--- a/gpsmon.c
+++ b/gpsmon.c
@@ -838,7 +838,7 @@ static void gpsmon_hook(struct gps_device_t *device, gps_mask_t changed UNUSED)
 
     if (logfile != NULL && device->lexer.outbuflen > 0) {
         /*@ -shiftimplementation -sefparams +charint @*/
-        size_t written_count = fwrite
+        UNUSED size_t written_count = fwrite
                (device->lexer.outbuffer, sizeof(char),
                 device->lexer.outbuflen, logfile);
         assert(written_count >= 1);