iio: dac: ad8460: Stop using iio_device_claim_direct_scoped()

This complex cleanup.h use case of conditional guards has proved
to be more trouble that it is worth in terms of false positive compiler
warnings and hard to read code.

Move directly to the new claim/release_direct() that allow sparse
to check for unbalanced context.

Cc: Mariel Tinaco <[e-mail]>
Reviewed-by: David Lechner <[e-mail]>
Reviewed-by: Nuno Sa <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jonathan Cameron <[e-mail]>

drivers/iio/dac/ad8460.c

···
 	if (ret)
 		return ret;
 
-	iio_device_claim_direct_scoped(return -EBUSY, indio_dev)
-		return ad8460_enable_apg_mode(state, toggle_en);
-	unreachable();
+	if (!iio_device_claim_direct(indio_dev))
+		return -EBUSY;
+
+	ret = ad8460_enable_apg_mode(state, toggle_en);
+	iio_device_release_direct(indio_dev);
+	return ret;
 }
 
 static ssize_t ad8460_read_powerdown(struct iio_dev *indio_dev, uintptr_t private,
···
 			    long mask)
 {
 	struct ad8460_state *state = iio_priv(indio_dev);
+	int ret;
 
 	switch (mask) {
 	case IIO_CHAN_INFO_RAW:
 		switch (chan->type) {
 		case IIO_VOLTAGE:
-			iio_device_claim_direct_scoped(return -EBUSY, indio_dev)
-				return ad8460_set_sample(state, val);
-			unreachable();
+			if (!iio_device_claim_direct(indio_dev))
+				return -EBUSY;
+			ret = ad8460_set_sample(state, val);
+			iio_device_release_direct(indio_dev);
+			return ret;
 		case IIO_CURRENT:
 			return regmap_write(state->regmap, AD8460_CTRL_REG(0x04),
 					    FIELD_PREP(AD8460_QUIESCENT_CURRENT_MSK, val));