avcodec/ttaenc: use av_malloc_array()

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/ttaenc.c

@@ -53,7 +53,7 @@ static av_cold int tta_encode_init(AVCodecContext *avctx)
     s->bps = avctx->bits_per_raw_sample >> 3;
     avctx->frame_size = 256 * avctx->sample_rate / 245;
 
-    s->ch_ctx = av_malloc(avctx->channels * sizeof(*s->ch_ctx));
+    s->ch_ctx = av_malloc_array(avctx->channels, sizeof(*s->ch_ctx));
     if (!s->ch_ctx)
         return AVERROR(ENOMEM);