fix a bug in fix.
@@ -944,7 +944,7 @@ static void add(struct m0_addb2_mach *mach,
while (n-- > 0)
buffer_add(buf, *value++);
}
- M0_POST_EX(trace_invariant(&buf->b_trace.o_tr));
+ M0_POST_EX(ergo(buf != NULL, trace_invariant(&buf->b_trace.o_tr)));
}
/**
