ALSA: snd-atmel-abdac: test wrong variable

After clk_get() pclk is checked second time instead of sample_clk check.
Signed-off-by: NVasiliy Kulikov <segoon@openwall.com>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

sound/atmel/abdac.c

@@ -420,7 +420,7 @@ static int __devinit atmel_abdac_probe(struct platform_device *pdev)
 		return PTR_ERR(pclk);
 	}
 	sample_clk = clk_get(&pdev->dev, "sample_clk");
-	if (IS_ERR(pclk)) {
+	if (IS_ERR(sample_clk)) {
 		dev_dbg(&pdev->dev, "no sample clock\n");
 		retval = PTR_ERR(pclk);
 		goto out_put_pclk;