Staging: iio: fix duplicate dev_attr_name

device attr's should be static, otherwise duplicate identifiers are
created:

drivers/staging/iio/trigger/iio-trig-gpio.o:(.data+0x1c): multiple definition of `dev_attr_name'
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/iio/accel/lis3l02dq_ring.c

@@ -441,7 +441,7 @@ static int lis3l02dq_data_rdy_trigger_set_state(struct iio_trigger *trig,
 				 &t);
 	return ret;
 }
-DEVICE_ATTR(name, S_IRUGO, iio_trigger_read_name, NULL);
+static DEVICE_ATTR(name, S_IRUGO, iio_trigger_read_name, NULL);
 
 static struct attribute *lis3l02dq_trigger_attrs[] = {
 	&dev_attr_name.attr,

drivers/staging/iio/trigger/iio-trig-gpio.c

@@ -46,7 +46,7 @@ static irqreturn_t iio_gpio_trigger_poll(int irq, void *private)
 	return IRQ_HANDLED;
 }
 
-DEVICE_ATTR(name, S_IRUGO, iio_trigger_read_name, NULL);
+static DEVICE_ATTR(name, S_IRUGO, iio_trigger_read_name, NULL);
 
 static struct attribute *iio_gpio_trigger_attrs[] = {
 	&dev_attr_name.attr,

drivers/staging/iio/trigger/iio-trig-periodic-rtc.c

@@ -81,10 +81,10 @@ static ssize_t iio_trig_periodic_read_name(struct device *dev,
 	return sprintf(buf, "%s\n", trig_info->name);
 }
 
-DEVICE_ATTR(name, S_IRUGO,
+static DEVICE_ATTR(name, S_IRUGO,
 	    iio_trig_periodic_read_name,
 	    NULL);
-DEVICE_ATTR(frequency, S_IRUGO | S_IWUSR,
+static DEVICE_ATTR(frequency, S_IRUGO | S_IWUSR,
 	    iio_trig_periodic_read_freq,
 	    iio_trig_periodic_write_freq);