Staging: iio: Remove exceptional & on function name

In this file, function names are otherwise used as pointers without &.

A simplified version of the Coccinelle semantic patch that makes this
change is as follows:

// <smpl>
@r@
identifier f;
@@

f(...) { ... }
@@
identifier r.f;
@@

- &f
+ f
// </smpl>
Signed-off-by: Shraddha Barke <shraddha.6596@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/iio/adc/ad7280a.c

@@ -817,7 +817,7 @@ static int ad7280_read_raw(struct iio_dev *indio_dev,
 }
 
 static const struct iio_info ad7280_info = {
-	.read_raw = &ad7280_read_raw,
+	.read_raw = ad7280_read_raw,
 	.event_attrs = &ad7280_event_attrs_group,
 	.attrs = &ad7280_attrs_group,
 	.driver_module = THIS_MODULE,

drivers/staging/iio/addac/adt7316.c

@@ -2152,7 +2152,7 @@ int adt7316_probe(struct device *dev, struct adt7316_bus *bus,
 
 		ret = devm_request_threaded_irq(dev, chip->bus.irq,
 						NULL,
-						&adt7316_event_handler,
+						adt7316_event_handler,
 						chip->bus.irq_flags |
 						IRQF_ONESHOT,
 						indio_dev->name,

drivers/staging/iio/resolver/ad2s1210.c

@@ -633,7 +633,7 @@ static int ad2s1210_initial(struct ad2s1210_state *st)
 }
 
 static const struct iio_info ad2s1210_info = {
-	.read_raw = &ad2s1210_read_raw,
+	.read_raw = ad2s1210_read_raw,
 	.attrs = &ad2s1210_attribute_group,
 	.driver_module = THIS_MODULE,
 };