power: supply: max17042: use dev_err_probe() where appropriate

power: supply: max17042: use dev_err_probe() where appropriate

dev_err_probe() exists to simplify code, harmonise error messages, and
set the deferred probe reason if relevant - there's no reason not to
use it here.

While at it, return the actual error from devm_regmap_init_i2c() rather
than overwriting with -EINVAL, when relevant.

Reviewed-by: Peter Griffin <peter.griffin@linaro.org>
Signed-off-by: André Draszik <andre.draszik@linaro.org>
Link: https://patch.msgid.link/20260302-max77759-fg-v3-5-3c5f01dbda23@linaro.org
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>