'devtype' is an enum, thus cast of pointer on 64-bit compile test with
W=1 causes:

  wm8904.c:2205:21: error: cast to smaller integer type 'enum wm8904_type' from 'const void *' [-Werror,-Wvoid-pointer-to-enum-cast]
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230815143204.379708-2-krzysztof.kozlowski@linaro.orgSigned-off-by: Mark Brown <broonie@kernel.org>