avcodec/hcadec: Fix memleak upon allocation error

An AVFloatDSPContext would leak upon av_tx_init() failure.

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavcodec/hcadec.c

@@ -455,6 +455,7 @@ const AVCodec ff_hca_decoder = {
     .decode         = decode_frame,
     .close          = decode_close,
     .capabilities   = AV_CODEC_CAP_DR1,
+    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
     .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
                                                       AV_SAMPLE_FMT_NONE },
 };