ALSA: ctxfi - Add prefix to debug prints

Added ctxfi: prefix to each debug print.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/ctxfi/ctamixer.c b/sound/pci/ctxfi/ctamixer.c
index 119791a..859e996 100644
--- a/sound/pci/ctxfi/ctamixer.c
+++ b/sound/pci/ctxfi/ctamixer.c
@@ -259,7 +259,7 @@
 	}
 	spin_unlock_irqrestore(&mgr->mgr_lock, flags);
 	if (err) {
-		printk(KERN_ERR "Can't meet AMIXER resource request!\n");
+		printk(KERN_ERR "ctxfi: Can't meet AMIXER resource request!\n");
 		goto error;
 	}
 
@@ -413,7 +413,7 @@
 	}
 	spin_unlock_irqrestore(&mgr->mgr_lock, flags);
 	if (err) {
-		printk(KERN_ERR "Can't meet SUM resource request!\n");
+		printk(KERN_ERR "ctxfi: Can't meet SUM resource request!\n");
 		goto error;
 	}