hwmon: fix array overruns in lm93.c

This fixes an array overflow bug. We have 4 pairs of min/max temperature
limits, not 3.
Signed-off-by: NHans J. Koch <hjk@linutronix.de>
Acked-by: NJean Delvare <khali@linux-fr.org>
Signed-off-by: NMark M. Hoffman <mhoffman@lightlink.com>

drivers/hwmon/lm93.c

@@ -234,7 +234,7 @@ struct lm93_data {
 	struct {
 		u8 min;
 		u8 max;
-	} temp_lim[3];
+	} temp_lim[4];
 
 	/* vin1 - vin16: low and high limits */
 	struct {