mmc: core: Silence compiler warning in __mmc_switch

Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>
Signed-off-by: NChris Ball <cjb@laptop.org>

drivers/mmc/core/mmc_ops.c

@@ -414,7 +414,7 @@ int __mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
 	int err;
 	struct mmc_command cmd = {0};
 	unsigned long timeout;
-	u32 status;
+	u32 status = 0;
 	bool ignore_crc = false;
 
 	BUG_ON(!card);