mmc: cb710: clear irq handler on init() error path

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: Chris Ball <cjb@laptop.org>
diff --git a/drivers/mmc/host/cb710-mmc.c b/drivers/mmc/host/cb710-mmc.c
index 5374b6b..2299afc 100644
--- a/drivers/mmc/host/cb710-mmc.c
+++ b/drivers/mmc/host/cb710-mmc.c
@@ -743,6 +743,7 @@
 err_free_mmc:
 	dev_dbg(cb710_slot_dev(slot), "mmc_add_host() failed: %d\n", err);
 
+	cb710_set_irq_handler(slot, NULL);
 	mmc_free_host(mmc);
 	return err;
 }