iio: imu: inv_mpu6050: return callee's error code rather than -EINVAL

regmap_bulk_write()/regmap_bulk_read() return zero or negative error
code, return the callee's error code is better than '-EINVAL'.

Signed-off-by: Su Hui <suhui@nfschina.com>
Link: https://lore.kernel.org/r/20231030020752.67630-1-suhui@nfschina.com


Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>