Avoid a possible null pointer dereference.

CC: [email protected]
Bug-Id: CID 1135769
---
 libavformat/aviobuf.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libavformat/aviobuf.c b/libavformat/aviobuf.c
index cc79146..6923b78 100644
--- a/libavformat/aviobuf.c
+++ b/libavformat/aviobuf.c
@@ -965,7 +965,7 @@ int ffio_open_dyn_packet_buf(AVIOContext **s, int 
max_packet_size)
 
 int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
 {
-    DynBuffer *d = s->opaque;
+    DynBuffer *d;
     int size;
     static const char padbuf[FF_INPUT_BUFFER_PADDING_SIZE] = {0};
     int padding = 0;
@@ -983,6 +983,7 @@ int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
 
     avio_flush(s);
 
+    d = s->opaque;
     *pbuffer = d->buffer;
     size = d->size;
     av_free(d);
-- 
1.9.3 (Apple Git-50)

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