[FFmpeg-cvslog] Revert "lavfi/avfiltergraph: add check before free the format"

[Andreas Rheinhardt]

ffmpeg | branch: master | Andreas Rheinhardt <andreas.rheinhardt at gmail.com> | Fri Aug  7 04:28:07 2020 +0200| [c4c10feaa8c3604abfec4283715b37358f73b6e7] | committer: Andreas Rheinhardt

Revert "lavfi/avfiltergraph: add check before free the format"

This reverts commit f156f4ab2317f22bfef33c7eaead0d5d5f162903.

The checks added by said commit are nonsense because they did not help
in case ff_merge_samplerates() or ff_merge_formats() returned NULL
while freeing one of its arguments: Said freeing does not change
the local variables of can_merge_formats().

Reviewed-by: Nicolas George <george at nsup.org>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=c4c10feaa8c3604abfec4283715b37358f73b6e7
---

 libavfilter/avfiltergraph.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/libavfilter/avfiltergraph.c b/libavfilter/avfiltergraph.c
index 2fe4f0b0f9..a149f8fb6d 100644
--- a/libavfilter/avfiltergraph.c
+++ b/libavfilter/avfiltergraph.c
@@ -419,10 +419,8 @@ static int can_merge_formats(AVFilterFormats *a_arg,
         av_freep(&ret);
         return 1;
     } else {
-        if (a)
-            av_freep(&a->formats);
-        if (b)
-            av_freep(&b->formats);
+        av_freep(&a->formats);
+        av_freep(&b->formats);
         av_freep(&a);
         av_freep(&b);
         return 0;