ossaudio: do not enable by default

Modern Linux's no longer support /dev/dsp so enabling it by
default causes audio failures on newer Linux distros.

Signed-off-by: Anthony Liguori <aliguori@amazon.com>
Tested-by: Andreas Färber <afaerber@suse.de>
Message-id: 1383497154-9271-1-git-send-email-aliguori@amazon.com
diff --git a/audio/ossaudio.c b/audio/ossaudio.c
index 007c641..3e04a58 100644
--- a/audio/ossaudio.c
+++ b/audio/ossaudio.c
@@ -932,7 +932,7 @@
     .init           = oss_audio_init,
     .fini           = oss_audio_fini,
     .pcm_ops        = &oss_pcm_ops,
-    .can_be_default = 1,
+    .can_be_default = 0,
     .max_voices_out = INT_MAX,
     .max_voices_in  = INT_MAX,
     .voice_size_out = sizeof (OSSVoiceOut),