[PATCH 4/5] mmc: mtk-sd: Fix usage of devm_clk_get_optional()

[AngeloGioacchino Del Regno]

If we get an error during probe of an optional clock with function
devm_clk_get_optional(), this means that the clock was provided, but
an error occurred: this has to be escalated to the probe function
for the driver probe to fail accordingly, or unexpected hardware
behavior may happen.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com>
---
 drivers/mmc/host/mtk-sd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
index f08695e52601..59d7decc3051 100644
--- a/drivers/mmc/host/mtk-sd.c
+++ b/drivers/mmc/host/mtk-sd.c
@@ -2528,7 +2528,7 @@ static int msdc_of_clock_parse(struct platform_device *pdev,
 	/*source clock control gate is optional clock*/
 	host->src_clk_cg = devm_clk_get_optional(&pdev->dev, "source_cg");
 	if (IS_ERR(host->src_clk_cg))
-		host->src_clk_cg = NULL;
+		return PTR_ERR(host->src_clk_cg);
 
 	host->sys_clk_cg = devm_clk_get_optional(&pdev->dev, "sys_cg");
 	if (IS_ERR(host->sys_clk_cg))
-- 
2.33.1