Another attempt to silence Coverity.

This may be the first time in my life that I've used difftime()...
which is strictly one of only two things you're actually allowed
to do with a time_t per the C standard (the other is convert into
a broken-down time).

src/syncterm/term.c

@@ -334,6 +334,7 @@ update_status(struct bbslist *bbs, int speed, int ooii_mode, bool ata_inv)
 	static int        oldspeed = 0;
 	static int        lastmouse = 0;
 	int               newmouse;
+	double            timeond;
 	int               timeon;
 	char              sep;
 	int               oldfont_norm;
@@ -378,12 +379,13 @@ update_status(struct bbslist *bbs, int speed, int ooii_mode, bool ata_inv)
 	lastupd = now;
 	lastmouse = newmouse;
 	oldspeed = speed;
-	if (now > (bbs->connected + 359999))
+	timeond = difftime(now, bbs->connected);
+	if (timeond > 350000)
 		timeon = 350000;
-	else if (now < bbs->connected)
+	else if (timeond < 0)
 		timeon = 0;
 	else
-		timeon = (int)(now - bbs->connected);
+		timeon = timeond;
 	gettextinfo(&txtinfo);
 	oldscroll = _wscroll;
 	hold_update = true;