iio: accel: st_accel: Drop unnecessary #else branch for ACPI

ACPI_PTR() takes care of the argument in case of !CONFIG_ACPI.
Remove unnecessary #else branch.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/accel/st_accel_i2c.c

@@ -119,8 +119,6 @@ static const struct acpi_device_id st_accel_acpi_match[] = {
 	{ },
 };
 MODULE_DEVICE_TABLE(acpi, st_accel_acpi_match);
-#else
-#define st_accel_acpi_match NULL
 #endif
 
 static const struct i2c_device_id st_accel_id_table[] = {