From 80a3227be624b475736ae765f57cb5f8c5f2373b Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Sun, 7 May 2017 22:30:59 +0200
Subject: [PATCH] ffprobe: make function replacement macros behave correctly

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 ffprobe.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/ffprobe.c b/ffprobe.c
index dd4358db9d..8129bcedf0 100644
--- a/ffprobe.c
+++ b/ffprobe.c
@@ -57,11 +57,11 @@
 #  ifdef pthread_mutex_lock
 #    undef pthread_mutex_lock
 #  endif
-#  define pthread_mutex_lock(a)
+#  define pthread_mutex_lock(a) do{}while(0)
 #  ifdef pthread_mutex_unlock
 #    undef pthread_mutex_unlock
 #  endif
-#  define pthread_mutex_unlock(a)
+#  define pthread_mutex_unlock(a) do{}while(0)
 #endif
 
 typedef struct InputStream {