g_assert(group->len > 0);
tf = &g_array_index (group, LttTracefile, 0);
header = (ltt_subbuffer_header_t *)tf->buffer.head;
- g_assert(parse_trace_header(header, tf, t) == 0);
+ ret = parse_trace_header(header, tf, t);
+ g_assert(!ret);
t->num_cpu = group->len;