avcodec/hevc_parser: check for av_mallocz() failure

Signed-off-by: Paul B Mahol <onemda@gmail.com>

libavcodec/hevc_parser.c

@@ -309,6 +309,8 @@ static int hevc_init(AVCodecParserContext *s)
 {
     HEVCContext  *h  = &((HEVCParseContext *)s->priv_data)->h;
     h->HEVClc = av_mallocz(sizeof(HEVCLocalContext));
+    if (!h->HEVClc)
+        return AVERROR(ENOMEM);
     h->skipped_bytes_pos_size = INT_MAX;
 
     return 0;