ASoC: meson: axg-card: fix null pointer dereference in clean up

When using modern dai_link style, we must first make sure the
struct snd_soc_dai_link_component exists before accessing its members.

In case of early probe deferral, some of the '.cpus' or '.codecs' may not
have been allocated yet. Check this before calling of_node_put() on the
structure member.

Fixes: c84836d7 ("ASoC: meson: axg-card: use modern dai_link style")
Cc: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Mark Brown <broonie@kernel.org>