ASoC: rt712-sdca: remove redundant else path of if statement

There is an if/else check where the else part is executed if
adc_vol_flag is true, this else path checks if adc_vol_flag
is true (which is a redundant second check) and the if path is
always taken. Remove the redundant check and remove the else
path since that can never occur.

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Link: https://patch.msgid.link/20250507140907.255562-1-colin.i.king@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: ColinIanKing

sound/soc/codecs/rt712-sdca.c

@@ -1065,12 +1065,8 @@ static int rt712_sdca_dmic_set_gain_get(struct snd_kcontrol *kcontrol,
 
 		if (!adc_vol_flag) /* boost gain */
 			ctl = regvalue / 0x0a00;
-		else { /* ADC gain */
-			if (adc_vol_flag)
-				ctl = p->max - (((0x1e00 - regvalue) & 0xffff) / interval_offset);
-			else
-				ctl = p->max - (((0 - regvalue) & 0xffff) / interval_offset);
-		}
+		else /* ADC gain */
+			ctl = p->max - (((0x1e00 - regvalue) & 0xffff) / interval_offset);
 
 		ucontrol->value.integer.value[i] = ctl;
 	}