ASoC: amd: acp: rembrandt: Drop if blocks with always false condition

rembrandt_audio_remove() is only called after a successful call to
rembrandt_audio_probe(). With the latter it's sure that dev_get_platdata()
returns a non-NULL value and also that ->base is non-NULL. So the
corresponding check can be dropped.

While touching these lines join declaration and assignment into a single
line and make use of dev = &pdev->dev;

This prepares converting platform driver remove callbacks to return void.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Takashi Iwai <tiwai@suse.de>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Link: https://lore.kernel.org/r/20230315150745.67084-3-u.kleine-koenig@pengutronix.de


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