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>

1 files changed, 2 insertions, 0 deletions

diff --git a/sound/pci/hda/hda_proc.c b/sound/pci/hda/hda_proc.c
index 2c981b55940b..254ab5204603 100644
--- a/sound/pci/hda/hda_proc.c
+++ b/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];