mfd: kempld: Use PTR_ERR_OR_ZERO() to simplify code
Use the standard error pointer macro to shorten the code and simplify.
Signed-off-by: Xichao Zhao <zhao.xichao@vivo.com>
Link: https://lore.kernel.org/r/20250812093104.103193-1-zhao.xichao@vivo.com
Signed-off-by: Lee Jones <lee@kernel.org>
authored by