ASoC: img-i2s-out: Fix runtime PM imbalance on error

ASoC: img-i2s-out: Fix runtime PM imbalance on error

BugLink: https://bugs.launchpad.net/bugs/1900624
[ Upstream commit 65bd91dd6957390c42a0491b9622cf31a2cdb140 ]

pm_runtime_get_sync() increments the runtime PM usage counter even
the call returns an error code. Thus a pairing decrement is needed
on the error handling path to keep the counter balanced.

Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn>
Link: https://lore.kernel.org/r/20200529012230.5863-1-dinghao.liu@zju.edu.cn
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Ian May <ian.may@canonical.com>