media: dvb-frontends/stv0910: fix STR assignment, remove unneeded var

According to the documentation, FE_SCALE_DECIBEL values should be assigned
to .svalue and not .uvalue, so let's do this. While at it, remove the
unneeded strength var from read_signal_strength().

Signed-off-by: Daniel Scheller <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/dvb-frontends/stv0910.c

···
 {
 	struct stv *state = fe->demodulator_priv;
 	struct dtv_frontend_properties *p = &state->fe.dtv_property_cache;
-	s64 strength;
 	u8 reg[2];
 	u16 agc;
 	s32 padc, power = 0;
···
 
 	padc = table_lookup(padc_lookup, ARRAY_SIZE(padc_lookup), power) + 352;
 
-	strength = (padc - agc);
-
 	p->strength.stat[0].scale = FE_SCALE_DECIBEL;
-	p->strength.stat[0].uvalue = strength;
+	p->strength.stat[0].svalue = (padc - agc);
 }
 
 static int read_status(struct dvb_frontend *fe, enum fe_status *status)