ALSA: emu10k1: Delete an unnecessary check before the function call "kfree"

The kfree() function tests whether its argument is NULL and then
returns immediately. Thus the test around the call is not needed.

This issue was detected by using the Coccinelle software.
Signed-off-by: NMarkus Elfring <elfring@users.sourceforge.net>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

sound/pci/emu10k1/p16v.c

@@ -166,11 +166,8 @@ static struct snd_pcm_hardware snd_p16v_capture_hw = {
 static void snd_p16v_pcm_free_substream(struct snd_pcm_runtime *runtime)
 {
 	struct snd_emu10k1_pcm *epcm = runtime->private_data;
-  
-	if (epcm) {
-		/* dev_dbg(emu->card->dev, "epcm free: %p\n", epcm); */
-		kfree(epcm);
-	}
+
+	kfree(epcm);
 }
 
 /* open_playback callback */