[media] cx23110: Fix return code for cx24110_set_fec()

When a parameter is invalid, the right return code is
-EINVAL.

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/dvb-frontends/cx24110.c

@@ -217,8 +217,7 @@ static int cx24110_set_fec (struct cx24110_state* state, fe_code_rate_t fec)
 			cx24110_writereg(state, 0x1b, g2[fec]);
 			/* not sure if this is the right way: I always used AutoAcq mode */
 	   } else
-		   return -EOPNOTSUPP;
+		   return -EINVAL;
-/* fixme (low): which is the correct return code? */
 	}
 	return 0;
 }