ASoC: tfa9879: Fix return value check in tfa9879_i2c_probe()

In case of error, the function devm_kzalloc() returns NULL
not ERR_PTR(). The IS_ERR() test in the return value check
should be replaced with NULL test.
Signed-off-by: NWei Yongjun <yongjun_wei@trendmicro.com.cn>
Acked-by: NPeter Rosin <peda@axentia.se>
Signed-off-by: NMark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org

sound/soc/codecs/tfa9879.c

@@ -280,8 +280,8 @@ static int tfa9879_i2c_probe(struct i2c_client *i2c,
 	int i;
 
 	tfa9879 = devm_kzalloc(&i2c->dev, sizeof(*tfa9879), GFP_KERNEL);
-	if (IS_ERR(tfa9879))
-		return PTR_ERR(tfa9879);
+	if (!tfa9879)
+		return -ENOMEM;
 
 	i2c_set_clientdata(i2c, tfa9879);