iio: accel: adxl313: add missing error check in predisable

iio: accel: adxl313: add missing error check in predisable

Check the return value of the FIFO bypass regmap_write() before
proceeding to disable interrupts.

Fixes: ff8093fa6ba4 ("iio: accel: adxl313: add buffered FIFO watermark with interrupt handling")
Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>