ALSA: snd-atmel-abdac: test wrong variable

After clk_get() pclk is checked second time instead of sample_clk check.

Signed-off-by: Vasiliy Kulikov <segoon@openwall.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/atmel/abdac.c b/sound/atmel/abdac.c
index f2f41c8..4e47baad 100644
--- a/sound/atmel/abdac.c
+++ b/sound/atmel/abdac.c
@@ -420,7 +420,7 @@
 		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;