[ALSA] Fix the type of enable module option

Fix the type of enable module option to bool.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 1426fa0..9d1412a 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -63,7 +63,7 @@
 
 /* just for backward compatibility */
 static int enable;
-module_param(enable, int, 0444);
+module_param(enable, bool, 0444);
 
 MODULE_LICENSE("GPL");
 MODULE_SUPPORTED_DEVICE("{{Intel, ICH6},"