w1: ds2482: do not use assignment in if condition

Assignments in if condition are less readable and error-prone.  Fixes
also checkpatch warning:

  ERROR: do not use assignment in if condition

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230415104304.104134-9-krzysztof.kozlowski@linaro.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>