greybus: sdio: change the order of remove and free mmc host

The mmc host should be removed frist. Then it
will be freed.
Signed-off-by: Phong Tran <tranmanphong@gmail.com>
Reviewed-by: Rui Miguel Silva <rui.silva@linaro.org>
Reviewed-by: Mark Greer <mgreer@animalcreek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/sdio.c

@@ -700,8 +700,8 @@ static void gb_sdio_connection_exit(struct gb_connection *connection)
 
 	flush_workqueue(gb_sdio_mrq_workqueue);
 	destroy_workqueue(gb_sdio_mrq_workqueue);
-	mmc_free_host(mmc);
 	mmc_remove_host(mmc);
+	mmc_free_host(mmc);
 	kfree(host->xfer_buffer);
 }