avformat: Replace ffurl_close() by ffurl_closep() where appropriate

It avoids leaving dangling pointers behind in memory.

Also remove redundant checks for whether the URLContext to be closed is
already NULL.

Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/libavformat/concat.c b/libavformat/concat.c
index cfe14760eb..418405dd50 100644
--- a/libavformat/concat.c
+++ b/libavformat/concat.c
@@ -49,7 +49,7 @@ static av_cold int concat_close(URLContext *h)
     struct concat_nodes *nodes = data->nodes;
 
     for (i = 0; i != data->length; i++)
-        err |= ffurl_close(nodes[i].uc);
+        err |= ffurl_closep(&nodes[i].uc);
 
     av_freep(&data->nodes);