Staging: iio/light: Fix return values in tsl2583.c

This patch fixes following smatch warnings:
/drivers/staging/iio/light/tsl2583.c:436 taos_chip_on() info: why not propagate 'ret' from i2c_smbus_write_byte_data() instead of (-1)?
/drivers/staging/iio/light/tsl2583.c:448 taos_chip_on() info: why not propagate 'ret' from i2c_smbus_write_byte_data() instead of (-1)?
/drivers/staging/iio/light/tsl2583.c:461 taos_chip_on() info: why not propagate 'ret' from i2c_smbus_write_byte_data() instead of (-1)?

Signed-off-by: Monam Agarwal <monamagarwal123@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>