shithub: git9

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fix crash.

--- a/ref.c

+++ b/ref.c

@@ -162,6 +162,8 @@

 			o = q->obj;

 			for(i = 0; i < o->commit->nparent; i++){

 				p = readobject(o->commit->parent[i]);

+				if(p == nil)

+					goto err;

 				h = hnode(ht, p);

 				if(h->mark != nil){

 					if(h->mark != q->mark){

@@ -176,6 +178,7 @@

 			}

 		}

 		if(q2 == nil){

+err:

 			werrstr("no common ancestor");

 			break;

 		}