V4L/DVB (5495): Tda10086: fix DiSEqC message length

Setting the message length to zero means to send one byte, so you need a
subtraction instead of an addition.

Signed-off-by: Andreas Oberritter <obi@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
diff --git a/drivers/media/dvb/frontends/tda10086.c b/drivers/media/dvb/frontends/tda10086.c
index 4c27a2d9..ccc429c 100644
--- a/drivers/media/dvb/frontends/tda10086.c
+++ b/drivers/media/dvb/frontends/tda10086.c
@@ -212,7 +212,7 @@
 	for(i=0; i< cmd->msg_len; i++) {
 		tda10086_write_byte(state, 0x48+i, cmd->msg[i]);
 	}
-	tda10086_write_byte(state, 0x36, 0x08 | ((cmd->msg_len + 1) << 4));
+	tda10086_write_byte(state, 0x36, 0x08 | ((cmd->msg_len - 1) << 4));
 
 	tda10086_diseqc_wait(state);