ASoC: rt5682: Remove unused variable in rt5682_i2c_remove()

In commit 772d4452 ("ASoC: rt5682: Properly turn off regulators if
wrong device ID") I deleted code but forgot to delete a variable
that's now unused. Delete it.

Fixes: 772d4452 ("ASoC: rt5682: Properly turn off regulators if wrong device ID")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/20210813073402.1.Iaa9425cfab80f5233afa78b32d02b6dc23256eb3@changeid


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