This silences a bunch of warnings with threads disabled.
---
 libavutil/thread.h | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/libavutil/thread.h b/libavutil/thread.h
index cf0fbdd..d107964 100644
--- a/libavutil/thread.h
+++ b/libavutil/thread.h
@@ -48,10 +48,10 @@
 
 #define AVMutex char
 
-#define ff_mutex_init(mutex, attr) (0)
-#define ff_mutex_lock(mutex) (0)
-#define ff_mutex_unlock(mutex) (0)
-#define ff_mutex_destroy(mutex) (0)
+#define ff_mutex_init(mutex, attr)
+#define ff_mutex_lock(mutex)
+#define ff_mutex_unlock(mutex)
+#define ff_mutex_destroy(mutex)
 
 #define AVOnce char
 #define AV_ONCE_INIT 0
-- 
2.1.4

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