Revert previous diff as it resulted in the wrong return code when

the last node is deleted.  Instead, resolve the Coverity warning
by returning (node *)1 when you delete the root node.
based an idea from millert@.  ok otto@

src/lib/libc/stdlib/tsearch.c

@@ -1,4 +1,4 @@
-/*	$OpenBSD: tsearch.c,v 1.6 2006/04/04 11:21:50 moritz Exp $	*/
+/*	$OpenBSD: tsearch.c,v 1.7 2012/02/06 20:29:54 guenther Exp $	*/
 
 /*
  * Tree search generalized from Knuth (6.2.2) Algorithm T just like
@@ -56,12 +56,12 @@ tdelete(const void *vkey, void **vrootp,
 {
     node **rootp = (node **)vrootp;
     char *key = (char *)vkey;
-    node *p;
+    node *p = (node *)1;
     node *q;
     node *r;
     int cmp;
 
-    if (rootp == (struct node_t **)0 || (p = *rootp) == (struct node_t *)0)
+    if (rootp == (struct node_t **)0 || *rootp == (struct node_t *)0)
 	return ((struct node_t *)0);
     while ((cmp = (*compar)(key, (*rootp)->key)) != 0) {
 	p = *rootp;
@@ -86,8 +86,6 @@ tdelete(const void *vkey, void **vrootp,
 	    q->right = (*rootp)->right;
 	}
     }
-    if (p == *rootp)
-        p = q;
     free((struct node_t *) *rootp);	/* D4: Free node */
     *rootp = q;				/* link parent to new node */
     return(p);