ALSA: hda - Return the error from get_wcaps_type() for invalid NIDs

When an invalid NID is given, get_wcaps() returns zero as the error,
but get_wcaps_type() takes it as the normal value and returns a bogus
AC_WID_AUD_OUT value.  This confuses the parser.

With this patch, get_wcaps_type() returns -1 when value 0 is given,
i.e. an invalid NID is passed to get_wcaps().

Bugzilla: https://bugzilla.novell.com/show_bug.cgi?id=740118

Cc: <stable@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/hda_local.h

@@ -488,7 +488,12 @@ static inline u32 get_wcaps(struct hda_codec *codec, hda_nid_t nid)
 }
 
 /* get the widget type from widget capability bits */
-#define get_wcaps_type(wcaps) (((wcaps) & AC_WCAP_TYPE) >> AC_WCAP_TYPE_SHIFT)
+static inline int get_wcaps_type(unsigned int wcaps)
+{
+	if (!wcaps)
+		return -1; /* invalid type */
+	return (wcaps & AC_WCAP_TYPE) >> AC_WCAP_TYPE_SHIFT;
+}
 
 static inline unsigned int get_wcaps_channels(u32 wcaps)
 {

sound/pci/hda/hda_proc.c

@@ -54,6 +54,8 @@ static const char *get_wid_type_name(unsigned int wid_value)
 		[AC_WID_BEEP] = "Beep Generator Widget",
 		[AC_WID_VENDOR] = "Vendor Defined Widget",
 	};
+	if (wid_value == -1)
+		return "UNKNOWN Widget";
 	wid_value &= 0xf;
 	if (names[wid_value])
 		return names[wid_value];