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rethread: correctly update number of message children

--- a/mbox.c

+++ b/mbox.c

@@ -530,10 +530,13 @@

 	/* remove child, preserving order */

 	j = 0;

 	p = m->parent;

-	for(i = 0; p && i < p->nchild; i++){

-		if(p->child[i] != m)

-			j++;

-		p->child[j] = p->child[i];

+	if(p != nil){

+		for(i = 0; p && i < p->nchild; i++){

+			if(p->child[i] != m)

+				j++;

+			p->child[j] = p->child[i];

+		}

+		p->nchild = j;

 	}

 	/* reparent children */