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mbox: remove child from correct index

when deleting messages, we were incrementing the
deletion index too early, which would clear the
wrong child when reparenting.

--- a/mbox.c

+++ b/mbox.c

@@ -660,10 +660,9 @@

 	if(p != nil){

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

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

-				j++;

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

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

 		}

-		p->nchild--;

+		p->nchild = j;

 		for(pp = p; pp != nil; pp = pp->parent)

 			pp->nsub--;

 	}