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add missing braces to if-else chain

Otherwise, the `else` statements associate to the
immediately-preceding `if`.

--- a/ref.c

+++ b/ref.c

@@ -419,18 +419,19 @@

 		idx = earealloc(idx, (nall + 1), sizeof(int));

 		all[nall] = p;

 		idx[nall] = 0;

-		if(p == a || p->commit->nparent == 0 && a == &zcommit)

+		if(p == a || p->commit->nparent == 0 && a == &zcommit){

 			if((nall = unwind(ev, all, idx, nall, &p, &keep, 1)) == -1)

 				break;

-		else if(p->commit->nparent == 0)

+		}else if(p->commit->nparent == 0){

 			if((nall = unwind(ev, all, idx, nall, &p, &skip, 0)) == -1)

 				break;

-		else if(oshas(&keep, p->hash))

+		}else if(oshas(&keep, p->hash)){

 			if((nall = unwind(ev, all, idx, nall, &p, &keep, 1)) == -1)

 				break;

-		else if(oshas(&skip, p->hash))

+		}else if(oshas(&skip, p->hash)){

 			if((nall = unwind(ev, all, idx, nall, &p, &skip, 0)) == -1)

 				break;

+		}

 		if(p->commit->nparent == 0)

 			break;

 		if((p = readobject(p->commit->parent[idx[nall]])) == nil)