ASoC: rockchip: Fix a reference count leak.

Calling pm_runtime_get_sync increments the counter even in case of
failure, causing incorrect ref count if pm_runtime_put is not called in
error handling paths. Call pm_runtime_put if pm_runtime_get_sync fails.

Fixes: fc05a5b2 ("ASoC: rockchip: add support for pdm controller")
Signed-off-by: NQiushi Wu <wu000273@umn.edu>
Reviewed-by: NHeiko Stuebner <heiko@sntech.de>
Link: https://lore.kernel.org/r/20200613205158.27296-1-wu000273@umn.eduSigned-off-by: NMark Brown <broonie@kernel.org>

sound/soc/rockchip/rockchip_pdm.c

@@ -590,8 +590,10 @@ static int rockchip_pdm_resume(struct device *dev)
 	int ret;
 
 	ret = pm_runtime_get_sync(dev);
-	if (ret < 0)
+	if (ret < 0) {
+		pm_runtime_put(dev);
 		return ret;
+	}
 
 	ret = regcache_sync(pdm->regmap);