lavc/avpacket: Fix undefined behaviour, do not pass a null pointer to memcpy().

Fixes ticket #5128.

libavcodec/avpacket.c

@@ -581,6 +581,7 @@ int av_packet_ref(AVPacket *dst, const AVPacket *src)
         ret = packet_alloc(&dst->buf, src->size);
         if (ret < 0)
             goto fail;
+        if (src->size)
             memcpy(dst->buf->data, src->data, src->size);
 
         dst->data = dst->buf->data;