ASoC: rsnd: cleanup ppcheck warning for ssiu.c

ASoC: rsnd: cleanup ppcheck warning for ssiu.c

This patch cleanups below ppcheck warning.

sound/soc/sh/rcar/ssiu.c:212:10: style: The scope of the variable 'shift' can be reduced. [variableScope]
  int i, shift;
         ^
sound/soc/sh/rcar/ssiu.c:337:19: style: The scope of the variable 'mod' can be reduced. [variableScope]
 struct rsnd_mod *mod;
                  ^
sound/soc/sh/rcar/ssiu.c:362:22: style: The scope of the variable 'np' can be reduced. [variableScope]
 struct device_node *np;
                     ^
sound/soc/sh/rcar/ssiu.c:363:19: style: The scope of the variable 'mod' can be reduced. [variableScope]
 struct rsnd_mod *mod;
                  ^
sound/soc/sh/rcar/ssiu.c:366:6: style: The scope of the variable 'i' can be reduced. [variableScope]
 int i;
     ^
sound/soc/sh/rcar/ssiu.c:397:13: style: The scope of the variable 'ret' can be reduced. [variableScope]
 int i, nr, ret;
            ^

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87lfbdro2p.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>