drivers: sensor: ds18b20: Fix temperature calculation for ds18s20

The millionths value is calculated incorrectly.
The sensor has a precision of 0.5 which is 500000 millionths, but
there is an extra zero in the code. This fix removes the extra zero.

Signed-off-by: Sašo Domadenik <saso.doma@gmail.com>
1 file changed