stmsdf: Fix ..printf parameters for MSVC. Before we got always a altitude of ZERO.

diff --git a/gpsbabel/stmsdf.c b/gpsbabel/stmsdf.c
index 76c7c3edf327e7c402feffa78727a4254963877c..ac69fd2320e13913decf95f23708851f61c36268 100644 (file)
--- a/gpsbabel/stmsdf.c
+++ b/gpsbabel/stmsdf.c
@@ -605,7 +605,7 @@ static void
 track_disp_custom_cb(const waypoint *wpt)
 {
        if (wpt->creation_time && (wpt->altitude != unknown_alt)) {
-               gbfprintf(fout, "%lu,%.f\n", wpt->creation_time - start_time, wpt->altitude);
+               gbfprintf(fout, "%d,%.f\n", (int)(wpt->creation_time - start_time), wpt->altitude);
        }
 }