ASoC: soc-core: cleanup cppcheck warning at snd_soc_get_dai_name()

This patch cleanups below cppcheck warning.

sound/soc/soc-core.c:3203:22: style: The scope of the variable 'component_of_node' can be reduced. [variableScope]
 struct device_node *component_of_node;
                     ^

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87v94tyl6t.wl-kuninori.morimoto.gx@renesas.com


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