[PATCH] spi: microchip-core: fix passing zero to PTR_ERR warning

[Conor Dooley <conor.dooley@xxxxxxxxxxxxx>]

It is possible that the error case for devm_clk_get() returns NULL,
in which case zero will be passed to PTR_ERR() as shown by the Smatch
static checker warning:
drivers/spi/spi-microchip-core.c:557 mchp_corespi_probe()
warn: passing zero to 'PTR_ERR'

Fix the warning by explicitly returning an error if devm_clk_get()
returns NULL.

Fixes: 9ac8d17694b6 ("spi: add support for microchip fpga spi controllers")
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Link: https://lore.kernel.org/linux-spi/20220615091633.GI2168@kadam/
Signed-off-by: Conor Dooley <conor.dooley@xxxxxxxxxxxxx>
---
 drivers/spi/spi-microchip-core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/spi/spi-microchip-core.c b/drivers/spi/spi-microchip-core.c
index 5b2aee30fa04..d44663cca071 100644
--- a/drivers/spi/spi-microchip-core.c
+++ b/drivers/spi/spi-microchip-core.c
@@ -554,7 +554,7 @@ static int mchp_corespi_probe(struct platform_device *pdev)
 
 	spi->clk = devm_clk_get(&pdev->dev, NULL);
 	if (!spi->clk || IS_ERR(spi->clk)) {
-		ret = PTR_ERR(spi->clk);
+		ret = !spi->clk ? -ENXIO : PTR_ERR(spi->clk);
 		dev_err(&pdev->dev, "could not get clk: %d\n", ret);
 		goto error_release_master;
 	}
-- 
2.36.1