nutdec: check return value of av_new_packet()

Fixes CID733173.
Signed-off-by: Paul B Mahol <onemda@gmail.com>

libavformat/nutdec.c

@@ -854,7 +854,8 @@ static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code)
         return 1;
     }
 
-    av_new_packet(pkt, size + nut->header_len[header_idx]);
+    if (av_new_packet(pkt, size + nut->header_len[header_idx]) < 0)
+        return AVERROR(ENOMEM);
     memcpy(pkt->data, nut->header[header_idx], nut->header_len[header_idx]);
     pkt->pos = avio_tell(bc); // FIXME
     avio_read(bc, pkt->data + nut->header_len[header_idx], size);