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

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

This patch cleanups below cppcheck warning.

sound/soc/soc-dapm.c:3007:30: style: The scope of the variable 'wsource' can be reduced. [variableScope]
 struct snd_soc_dapm_widget *wsource, *wsink;
                             ^
sound/soc/soc-dapm.c:3007:40: style: The scope of the variable 'wsink' can be reduced. [variableScope]
 struct snd_soc_dapm_widget *wsource, *wsink;
                                       ^

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87o8acu24f.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>