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MIPS: ath79: fix maximum timeout

If the userland tries to set a timeout higher than the max_timeout, then we should fallback to max_timeout.

Signed-off-by: John Crispin <blogic@openwrt.org>

--- a/drivers/watchdog/ath79_wdt.c
+++ b/drivers/watchdog/ath79_wdt.c
@@ -115,10 +115,14 @@ static inline void ath79_wdt_disable(voi
 
 static int ath79_wdt_set_timeout(int val)
 {
-       if (val < 1 || val > max_timeout)
+       if (val < 1)
                return -EINVAL;
 
-       timeout = val;
+       if (val > max_timeout)
+               timeout = max_timeout;
+       else
+               timeout = val;
+
        ath79_wdt_keepalive();
 
        return 0;