Staging: iio/dac/ad5064.c: signedness bug in ad5064_read_raw()

regulator_get_voltage() returns an int so "scale_uv" should be an
int. Making it unsigned here breaks the error handling.

Signed-off-by: Dan Carpenter <[e-mail]>
Acked-by: Lars-Peter Clausen <[e-mail]>
Acked-by: Jonathan Cameron <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/iio/dac/ad5064.c

···
 			   long m)
 {
 	struct ad5064_state *st = iio_priv(indio_dev);
-	unsigned long scale_uv;
 	unsigned int vref;
+	int scale_uv;
 
 	switch (m) {
 	case 0: