ASoC: rsnd: rsnd_mod_id() return -1 if mod was NULL

enabling to use same method for exception case is useful.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Tested-by: Keita Kobayashi <keita.kobayashi.ym@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
1 file changed