V4L/DVB (7630): au8522: fix au8522_read_ucblocks for qam

ucblocks are reported in separate registers for vsb & qam
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/dvb/frontends/au8522.c

@@ -340,7 +340,10 @@ static int au8522_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
 {
 	struct au8522_state *state = fe->demodulator_priv;
 
+	if (state->current_modulation == VSB_8)
 		*ucblocks = au8522_readreg(state, 0x4087);
+	else
+		*ucblocks = au8522_readreg(state, 0x4543);
 
 	return 0;
 }