If debug() is not used, then the whole content of debug(...) will
be removed by the preprocessor, which will result in the following
warning. This patch adds __maybe_unused annotation to fix this.

drivers/mmc/mmc.c: In function ‘mmc_init’:
drivers/mmc/mmc.c:1685:11: warning: variable ‘start’ set but not used 
[-Wunused-but-set-variable]
  unsigned start;

Signed-off-by: Marek Vasut <ma...@denx.de>
Cc: Pantelis Antoniou <pa...@antoniou-consulting.com>
Cc: Tom Rini <tr...@konsulko.com>
Cc: Jaehoon Chung <jh80.ch...@samsung.com>
---
 drivers/mmc/mmc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index d6b7e4f..6e25b67 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -1708,7 +1708,7 @@ static int mmc_complete_init(struct mmc *mmc)
 int mmc_init(struct mmc *mmc)
 {
        int err = 0;
-       unsigned start;
+       __maybe_unused unsigned start;
 #ifdef CONFIG_DM_MMC
        struct mmc_uclass_priv *upriv = dev_get_uclass_priv(mmc->dev);
 
-- 
2.10.2

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