media: cx231xx: Set mfe_shared if second frontend found

If frontend[1] exists, then enable the dvb adapter mfe lock system.
Signed-off-by: Brad Love <brad@nextdimension.cc>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/usb/cx231xx/cx231xx-dvb.c

@@ -504,6 +504,9 @@ static int register_dvb(struct cx231xx_dvb *dvb,
 				dev->name, result);
 			goto fail_frontend1;
 		}
+
+		/* MFE lock */
+		dvb->adapter.mfe_shared = 1;
 	}
 
 	/* register demux stuff */