[MMC] au1xmmc: Fix a compilation warning ('status' is not used)

Fix a trivial compilation warning:

  CC      drivers/mmc/au1xmmc.o
drivers/mmc/au1xmmc.c: In function ‘au1xmmc_dma_callback’:
drivers/mmc/au1xmmc.c:743: warning: unused variable ‘status’
Signed-off-by: Martin Michlmayr <tbm@cyrius.com>
Acked-by: Martin Michlmayr <tbm@cyrius.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

drivers/mmc/au1xmmc.c

@@ -740,7 +740,6 @@ static void au1xmmc_set_ios(struct mmc_host* mmc, struct mmc_ios* ios)
 static void au1xmmc_dma_callback(int irq, void *dev_id, struct pt_regs *regs)
 {
 	struct au1xmmc_host *host = (struct au1xmmc_host *) dev_id;
-	u32 status;
 
 	/* Avoid spurious interrupts */