ALSA: hda - Begin HDA_GEN_* event tag from 1

... to distinguish from the invalid event type.
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/hda_generic.h

@@ -14,7 +14,7 @@
 
 /* unsol event tags */
 enum {
-	HDA_GEN_HP_EVENT, HDA_GEN_FRONT_EVENT, HDA_GEN_MIC_EVENT,
+	HDA_GEN_HP_EVENT = 1, HDA_GEN_FRONT_EVENT, HDA_GEN_MIC_EVENT,
 	HDA_GEN_LAST_EVENT = HDA_GEN_MIC_EVENT
 };