Merge commit '617814b4'

* commit '617814b4':
  buffersrc: Fix resource leak on error
Merged-by: Michael Niedermayer <michaelni@gmx.at>

libavfilter/buffersrc.c

@@ -242,6 +242,7 @@ do {                                                                    \
     ref_out = av_buffer_create(data, data_size, compat_unref_buffer,    \
                                dummy_ref, (buf->perms & AV_PERM_WRITE) ? 0 : AV_BUFFER_FLAG_READONLY);                           \
     if (!ref_out) {                                                     \
+        av_freep(&dummy_ref);                                           \
         av_frame_unref(frame);                                          \
         ret = AVERROR(ENOMEM);                                          \
         goto fail;                                                      \