iio: hid-sensors: Fix compilation warning

Move the 'static' keyword to beginning of definition to silence the
following compilation warning:
drivers/iio/common/hid-sensors/hid-sensor-attributes.c:34:1: warning: ‘static’ is not at beginning of declaration [-Wold-style-declaration]

Signed-off-by: Sachin Kamat <[e-mail]>
Cc: Srinivas Pandruvada <[e-mail]>
Signed-off-by: Jonathan Cameron <[e-mail]>

drivers/iio/common/hid-sensors/hid-sensor-attributes.c

···
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
 
-struct {
+static struct {
 	u32 usage_id;
 	int unit; /* 0 for default others from HID sensor spec */
 	int scale_val0; /* scale, whole number */
 	int scale_val1; /* scale, fraction in micros */
-} static unit_conversion[] = {
+} unit_conversion[] = {
 	{HID_USAGE_SENSOR_ACCEL_3D, 0, 9, 806650},
 	{HID_USAGE_SENSOR_ACCEL_3D,
 		HID_USAGE_SENSOR_UNITS_METERS_PER_SEC_SQRD, 1, 0},