From e301306a35f4b46a224c2e6b8900abee94cfddb8 Mon Sep 17 00:00:00 2001
From: Paul Lietar <paul@lietar.net>
Date: Sun, 9 Jun 2013 20:32:29 +0200
Subject: [PATCH] Fix libao output driver.

The driver id returned by libao wasn't checked correctly.
When the driver did not exist, libao returns a negative number. The
libao output driver checked for a non zero id.
This caused shairport to refuse to use the first driver, and not fail
when using a non-existant driver.
---
 audio_ao.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/audio_ao.c b/audio_ao.c
index 269aac56..c9ccd309 100644
--- a/audio_ao.c
+++ b/audio_ao.c
@@ -55,7 +55,7 @@ static int init(int argc, char **argv) {
         switch (opt) {
             case 'd':
                 driver = ao_driver_id(optarg);
-                if (!driver)
+                if (driver < 0)
                     die("could not find ao driver %s", optarg);
                 break;
             case 'i':