mmc: core: Fix typo at mmc_card_sleep

Fix wrong bus_ops->sleep check.  (This isn't expected to have real-world
consequences, because the mmc core always defines both 'awake' and
'sleep' ops.)
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

drivers/mmc/core/core.c

@@ -2218,7 +2218,7 @@ int mmc_card_sleep(struct mmc_host *host)
 
 	mmc_bus_get(host);
 
-	if (host->bus_ops && !host->bus_dead && host->bus_ops->awake)
+	if (host->bus_ops && !host->bus_dead && host->bus_ops->sleep)
 		err = host->bus_ops->sleep(host);
 
 	mmc_bus_put(host);