mmc: core: simplify an expression

We already have 'host' as a variable, so use it.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Tested-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Link: https://lore.kernel.org/r/20200901150250.26236-5-wsa+renesas@sang-engineering.comSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/core/mmc.c

@@ -1173,7 +1173,7 @@ static int mmc_select_hs400(struct mmc_card *card)
 		host->ops->hs400_downgrade(host);
 
 	/* Set host controller to HS timing */
-	mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
+	mmc_set_timing(host, MMC_TIMING_MMC_HS);
 
 	/* Reduce frequency to HS frequency */
 	max_dtr = card->ext_csd.hs_max_dtr;