mmc: dw_mmc: remove the unnecessary mmc_data structure

Remove the unnecessary mmc_data structure.
Instead, cmd->data can be used.

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/dw_mmc.c

@@ -236,7 +236,6 @@ static void mci_send_cmd(struct dw_mci_slot *slot, u32 cmd, u32 arg);
 
 static u32 dw_mci_prepare_command(struct mmc_host *mmc, struct mmc_command *cmd)
 {
-	struct mmc_data	*data;
 	struct dw_mci_slot *slot = mmc_priv(mmc);
 	struct dw_mci *host = slot->host;
 	u32 cmdr;
@@ -291,10 +290,9 @@ static u32 dw_mci_prepare_command(struct mmc_host *mmc, struct mmc_command *cmd)
 	if (cmd->flags & MMC_RSP_CRC)
 		cmdr |= SDMMC_CMD_RESP_CRC;
 
-	data = cmd->data;
-	if (data) {
+	if (cmd->data) {
 		cmdr |= SDMMC_CMD_DAT_EXP;
-		if (data->flags & MMC_DATA_WRITE)
+		if (cmd->data->flags & MMC_DATA_WRITE)
 			cmdr |= SDMMC_CMD_DAT_WR;
 	}