avcodec/cfhdenc: Fix leaks on allocation errors

The CineForm HD encoder attempts to allocate several buffers in its init
function; yet if only some of these allocations succeed, the
successfully allocated buffers leak. This is fixed by setting the
FF_CODEC_CAP_INIT_CLEANUP flag.
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

libavcodec/cfhdenc.c

@@ -919,4 +919,5 @@ AVCodec ff_cfhd_encoder = {
                           AV_PIX_FMT_GBRAP12,
                           AV_PIX_FMT_NONE
                         },
+    .caps_internal    = FF_CODEC_CAP_INIT_CLEANUP,
 };