[ALSA] Fix a typo in comments

HDA generic driver
Fix a typo in comments.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/hda/hda_generic.c b/sound/pci/hda/hda_generic.c
index c233e7f..bfbeff2 100644
--- a/sound/pci/hda/hda_generic.c
+++ b/sound/pci/hda/hda_generic.c
@@ -44,7 +44,7 @@
 	struct list_head list;
 };
 
-/* pathc-specific record */
+/* patch-specific record */
 struct hda_gspec {
 	struct hda_gnode *dac_node;	/* DAC node */
 	struct hda_gnode *out_pin_node;	/* Output pin (Line-Out) node */