[WATCHDOG] ib700wdt.c - fix buffer_underflow bug

This fixes Bug 11399:
if ibwdt_set_heartbeat(int t) is called with value 30 then
the check "if ((t < 0) || (t > 30))" in ibwdt_set_heartbeat
is not going to fail because t == 30, but in the loop, the
check wd_times[i] > t is never going to be true because
none of the wd_times are greater than the value of t (i.e. 30).
So we are exiting the loop with i == -1 and therefore setting
wd_margin to -1 which is wrong.
Reported-by: Zvonimir Rakamaric <zrakamar@cs.ubc.ca>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

drivers/watchdog/ib700wdt.c

@@ -154,7 +154,7 @@ static int ibwdt_set_heartbeat(int t)
 		return -EINVAL;
 
 	for (i = 0x0F; i > -1; i--)
-		if (wd_times[i] > t)
+		if (wd_times[i] >= t)
 			break;
 	wd_margin = i;
 	return 0;