regulator: core: Ensure selector is mapped

Clearly the testing only covered the bottom range.

Signed-off-by: Mark Brown <broonie@linaro.org>

drivers/regulator/core.c

@@ -2446,6 +2446,8 @@ int regulator_map_voltage_linear_range(struct regulator_dev *rdev,
 				return ret;
 		}
 
+		ret += range->min_sel;
+
 		break;
 	}