ASoC: soc-dapm.c: don't use WARN_ON() at snd_soc_dai_link_event_pre_pmu()

ASoC: soc-dapm.c: don't use WARN_ON() at snd_soc_dai_link_event_pre_pmu()

Current snd_soc_dai_link_event_pre_pmu() is checking "config".
It is using dev_err() (A) if it was NULL, so we don't need to use
WARN_ON() (B) to check it, it is over-kill. This patch removes it.

(B)	if (WARN_ON(!config)) {
(A)		dev_err(...);
		...
	}

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87zgfd8l7s.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>