ASoC: soc-dapm: cleanup cppcheck warning at dapm_seq_check_event()

This patch cleanups below cppcheck warning.

sound/soc/soc-dapm.c:1531:13: style: The scope of the variable 'ret' can be reduced. [variableScope]
 int power, ret;
            ^

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87r1f8u24n.wl-kuninori.morimoto.gx@renesas.com


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