regulator: Fix the s5m8767a problem of the division by null

If ramp_delay is 0, delay value can be divided by zero.
This patch can fix the problem.

Signed-off-by: Sangbeom Kim <sbkim73@samsung.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/drivers/regulator/s5m8767.c b/drivers/regulator/s5m8767.c
index 290d6fc..9caadb4 100644
--- a/drivers/regulator/s5m8767.c
+++ b/drivers/regulator/s5m8767.c
@@ -451,7 +451,7 @@
 
 	desc = reg_voltage_map[reg_id];
 
-	if (old_sel < new_sel)
+	if ((old_sel < new_sel) && s5m8767->ramp_delay)
 		return DIV_ROUND_UP(desc->step * (new_sel - old_sel),
 					s5m8767->ramp_delay * 1000);
 	return 0;