V4L/DVB (9771): tuner-xc2028: fix a small warning

/home/mauro/v4l-dvb/v4l/tuner-xc2028.c: In function 'xc2028_sleep':
/home/mauro/v4l-dvb/v4l/tuner-xc2028.c:1111: warning: 'return' with no value, in function returning non-void
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/common/tuners/tuner-xc2028.c

@@ -1104,7 +1104,7 @@ static int xc2028_sleep(struct dvb_frontend *fe)
 
 	/* Avoid firmware reload on slow devices */
 	if (no_poweroff)
-		return;
+		return 0;
 
 	tuner_dbg("Putting xc2028/3028 into poweroff mode.\n");