regulator: pwm-regulator: Use dev_err_probe() for error paths in .probe()

One error path already used the dev_err_probe() helper. Make use of it
in the other error paths, too, for consistent output. This results in a
more compact source code and symbolic output of the error code.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://msgid.link/r/20240216071829.1513748-2-u.kleine-koenig@pengutronix.de


Signed-off-by: Mark Brown <broonie@kernel.org>