mmc: dw_mmc-starfive: Fix initialization of prev_err

Fix a bug by making sure prev_err doesn't get used when being
uninitialized.

Signed-off-by: William Qiu <[email protected]>
Reported-by: Dan Carpenter <[email protected]>
Reviewed-by: Emil Renner Berthing <[email protected]>
Fixes: 9e62222 ("mmc: starfive: Add sdio/emmc driver support")
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Ulf Hansson <[email protected]>

Author: littleqyp

drivers/mmc/host/dw_mmc-starfive.c

@@ -51,7 +51,7 @@ static int dw_mci_starfive_execute_tuning(struct dw_mci_slot *slot,
 	struct dw_mci *host = slot->host;
 	struct starfive_priv *priv = host->priv;
 	int rise_point = -1, fall_point = -1;
-	int err, prev_err;
+	int err, prev_err = 0;
 	int i;
 	bool found = 0;
 	u32 regval;