mmc: Fix warning if debug() is not used

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;

Reviewed-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Pantelis Antoniou <panto@antoniou-consulting.com>
Cc: Jaehoon Chung <jh80.chung@samsung.com>

diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index 434eb28dc164a0bfba0f4906ad5e3dbf6f1b064d..6a19bbf504118095bb70e32343bbccdf39ed3fd4 100644 (file)
--- 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);