mmc: omap: Fix possible NULL pointer deref

Either OMAP_MMC_STAT_CARD_ERR or OMAP_MMC_STAT_END_OF_CMD might fire
if there is no host->cmd pointer.

Check for a valid host->cmd pointer before calling mmc_omap_cmd_done().

Signed-off-by: Michael Buesch <[e-mail]>
Acked-by: Tony Lindgren <[e-mail]>
Signed-off-by: Chris Ball <[e-mail]>

drivers/mmc/host/omap.c

···
 		return IRQ_HANDLED;
 	}
 
-	if (end_command)
+	if (end_command && host->cmd)
 		mmc_omap_cmd_done(host, host->cmd);
 	if (host->data != NULL) {
 		if (transfer_error)