(hash_value_for_key): Prevent endless loop when 0 was stored in a

hashtable.

From-SVN: r11926

gcc/objc/hash.c

 /* Hash tables for Objective C internal structures
-   Copyright (C) 1993 Free Software Foundation, Inc.
+   Copyright (C) 1993, 1996 Free Software Foundation, Inc.
 
 This file is part of GNU CC.
 
@@ -243,9 +243,10 @@ hash_value_for_key (cache_ptr cache, const void *key)
 
   if (node)
     do {
-      if ((*cache->compare_func)(node->key, key))
+      if ((*cache->compare_func)(node->key, key)) {
         retval = node->value;
-      else
+              break;
+      } else
         node = node->next;
     } while (!retval && node);