[ALSA] usb-audio - allow type 0 extension units

USB generic driver
Extension units can have type 0, so do not ignore them when constructing
mixer controls.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>

1 files changed, 0 insertions, 3 deletions

diff --git a/sound/usb/usbmixer.c b/sound/usb/usbmixer.c
index bfaec4fc1851..5683ae0b5ba1 100644
--- a/sound/usb/usbmixer.c
+++ b/sound/usb/usbmixer.c
@@ -1232,9 +1232,6 @@ static int build_audio_procunit(mixer_build_t *state, int unitid, unsigned char
         }
 
         type = combine_word(&dsc[4]);
-        if (! type)
-                return 0; /* undefined? */
-
         for (info = list; info && info->type; info++)
                 if (info->type == type)
                         break;