ASoC: ad1836: remove useless return

Cppcheck warning:

sound/soc/codecs/ad1836.c:311:9: warning: Identical condition and return expression 'ret', return value is always 0 [identicalConditionAfterEarlyExit]
 return ret;
        ^
sound/soc/codecs/ad1836.c:308:6: note: If condition 'ret' is true, the function will return/exit
 if (ret)
     ^
sound/soc/codecs/ad1836.c:311:9: note: Returning identical expression 'ret'
 return ret;
        ^

Likely copy/paste between adc and dac cases.
Signed-off-by: NPierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20210312182246.5153-3-pierre-louis.bossart@linux.intel.comSigned-off-by: NMark Brown <broonie@kernel.org>

sound/soc/codecs/ad1836.c

@@ -305,8 +305,6 @@ static int ad1836_probe(struct snd_soc_component *component)
 		return ret;
 
 	ret = snd_soc_dapm_add_routes(dapm, ad183x_adc_routes, num_adcs);
-	if (ret)
-		return ret;
 
 	return ret;
 }