regulator: lp872x: Do not hardcode return values

Propagate the error values returned by the function instead.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Mark Brown <broonie@linaro.org>
diff --git a/drivers/regulator/lp872x.c b/drivers/regulator/lp872x.c
index 2e4734f..2e022aa 100644
--- a/drivers/regulator/lp872x.c
+++ b/drivers/regulator/lp872x.c
@@ -211,7 +211,7 @@
 
 	ret = lp872x_read_byte(lp, LP872X_GENERAL_CFG, &val);
 	if (ret)
-		return -EINVAL;
+		return ret;
 
 	val = (val & mask) >> shift;
 	if (val >= size)
@@ -229,7 +229,7 @@
 	u8 addr, val;
 
 	if (time_step_us < 0)
-		return -EINVAL;
+		return time_step_us;
 
 	switch (rid) {
 	case LP8720_ID_LDO1 ... LP8720_ID_BUCK: