mmc: vub300: fix an error code

This error path should return -EINVAL instead of success.

Fixes: 88095e7b473a ("mmc: Add new VUB300 USB-to-SD/SDIO/MMC driver")
Signed-off-by: Dan Carpenter <[e-mail]>
Cc: [e-mail]
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Ulf Hansson <[e-mail]>

drivers/mmc/host/vub300.c

···
 		vub300->read_only =
 			(0x0010 & vub300->system_port_status.port_flags) ? 1 : 0;
 	} else {
+		retval = -EINVAL;
 		goto error5;
 	}
 	usb_set_intfdata(interface, vub300);