[PATCH] mmc: sdhci-brcmstb: Initialize base_clk to NULL in sdhci_brcmstb_probe()

[Nathan Chancellor]

Clang warns a few times along the lines of:

  drivers/mmc/host/sdhci-brcmstb.c:302:6: warning: variable 'base_clk' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
          if (res)
              ^~~
  drivers/mmc/host/sdhci-brcmstb.c:376:24: note: uninitialized use occurs here
          clk_disable_unprepare(base_clk);
                                ^~~~~~~~

base_clk is used in the error path before it is initialized. Initialize
it to NULL, as clk_disable_unprepare() calls clk_disable() and
clk_unprepare(), which both handle NULL pointers gracefully.

Fixes: 2cecaac1b21c ("mmc: sdhci-brcmstb: Add ability to increase max clock rate for 72116b0")
Link: https://github.com/ClangBuiltLinux/linux/issues/1650
Reported-by: kernel test robot <lkp at intel.com>
Signed-off-by: Nathan Chancellor <nathan at kernel.org>
---
 drivers/mmc/host/sdhci-brcmstb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mmc/host/sdhci-brcmstb.c b/drivers/mmc/host/sdhci-brcmstb.c
index f8dff8537920..28e9cf995c41 100644
--- a/drivers/mmc/host/sdhci-brcmstb.c
+++ b/drivers/mmc/host/sdhci-brcmstb.c
@@ -256,7 +256,7 @@ static int sdhci_brcmstb_probe(struct platform_device *pdev)
 	struct sdhci_host *host;
 	struct resource *iomem;
 	struct clk *clk;
-	struct clk *base_clk;
+	struct clk *base_clk = NULL;
 	int res;
 
 	match = of_match_node(sdhci_brcm_of_match, pdev->dev.of_node);

base-commit: 10980053142d8a3e86eb4d3014574424b42b7a45
-- 
2.36.1