ASoC: wm8994: Fix PM disable depth imbalance on error

ASoC: wm8994: Fix PM disable depth imbalance on error

The pm_runtime_enable will increase power disable depth. Thus
a pairing decrement is needed on the error handling path to
keep it balanced according to context.

Fixes: b22060326524f ("ASoC: wm8994: Move runtime PM init to platform device init")
Signed-off-by: Zhang Qilong <zhangqilong3@huawei.com>
Reviewed-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20201111041326.1257558-2-zhangqilong3@huawei.com
Signed-off-by: Mark Brown <broonie@kernel.org>