[media] cxd2841er: fix switch-case for DVB-C

DVB-C should use cxd2841er_read_agc_gain_c() to get the gain. The same
function is used for all DVB-C annex delivery systems.
Signed-off-by: Abylay Ospan <aospan@netup.ru>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/dvb-frontends/cxd2841er.c

@@ -1750,13 +1750,6 @@ static void cxd2841er_read_signal_strength(struct dvb_frontend *fe)
 
 	dev_dbg(&priv->i2c->dev, "%s()\n", __func__);
 	switch (p->delivery_system) {
-	case SYS_DVBC_ANNEX_B:
-	case SYS_DVBC_ANNEX_C:
-		strength = 65535 - cxd2841er_read_agc_gain_c(
-				priv, p->delivery_system);
-		p->strength.stat[0].scale = FE_SCALE_RELATIVE;
-		p->strength.stat[0].uvalue = strength;
-		break;
 	case SYS_DVBT:
 	case SYS_DVBT2:
 		strength = cxd2841er_read_agc_gain_t_t2(priv,
@@ -1766,7 +1759,9 @@ static void cxd2841er_read_signal_strength(struct dvb_frontend *fe)
 		p->strength.stat[0].uvalue = strength * 366 / 100 - 89520;
 		break;	/* Code moved out of the function */
 	case SYS_DVBC_ANNEX_A:
-		strength = cxd2841er_read_agc_gain_t_t2(priv,
+	case SYS_DVBC_ANNEX_B:
+	case SYS_DVBC_ANNEX_C:
+		strength = cxd2841er_read_agc_gain_c(priv,
 							p->delivery_system);
 		p->strength.stat[0].scale = FE_SCALE_DECIBEL;
 		/*