[FFmpeg-cvslog] Use AVOnce as a static variable consistently

[Hendrik Leppkes]

ffmpeg | branch: release/3.3 | Hendrik Leppkes <h.leppkes at gmail.com> | Mon May 22 12:00:23 2017 +0200| [8640339dbbb50a4031b71d092dad29fa036f4266] | committer: Hendrik Leppkes

Use AVOnce as a static variable consistently

Using AVOnce as a stack variable makes no sense as the state is lost
when the function exits.

This fixes repeated calls to av(filter/device)_register_all

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=8640339dbbb50a4031b71d092dad29fa036f4266
---

 libavdevice/alldevices.c | 2 +-
 libavfilter/allfilters.c | 2 +-
 libavformat/allformats.c | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/libavdevice/alldevices.c b/libavdevice/alldevices.c
index 280a260bd3..a8ed53ae5d 100644
--- a/libavdevice/alldevices.c
+++ b/libavdevice/alldevices.c
@@ -73,7 +73,7 @@ static void register_all(void)
 
 void avdevice_register_all(void)
 {
-    AVOnce control = AV_ONCE_INIT;
+    static AVOnce control = AV_ONCE_INIT;
 
     ff_thread_once(&control, register_all);
 }
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index ec6ec048e8..ba0949943a 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -381,7 +381,7 @@ static void register_all(void)
 
 void avfilter_register_all(void)
 {
-    AVOnce control = AV_ONCE_INIT;
+    static AVOnce control = AV_ONCE_INIT;
 
     ff_thread_once(&control, register_all);
 }
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index 09e62c3cfc..3e014c6063 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -384,7 +384,7 @@ static void register_all(void)
 
 void av_register_all(void)
 {
-    AVOnce control = AV_ONCE_INIT;
+    static AVOnce control = AV_ONCE_INIT;
 
     ff_thread_once(&control, register_all);
 }