Fix memory leak in hash table keys. Hash tables stay around forever.

keys go into and out of the table. the old code allocated the keys from
the hash table's arena, so they would grow without bounds. Now the keys
are allocated from the heap, and get freed when they are expunged from the
table.

security/nss/lib/base/hashops.c

@@ -32,7 +32,7 @@
  */
 
 #ifdef DEBUG
-static const char CVS_ID[] = "@(#) $RCSfile: hashops.c,v $ $Revision: 1.2 $ $Date: 2001/01/31 18:01:45 $ $Name:  $";
+static const char CVS_ID[] = "@(#) $RCSfile: hashops.c,v $ $Revision: 1.3 $ $Date: 2002/02/06 02:42:08 $ $Name:  $";
 #endif /* DEBUG */
 
 /*
@@ -82,7 +82,7 @@ nss_arena_hash_alloc_entry
   const void *key
 )
 {
-  NSSArena *arena = (NSSArena *)pool;
+  NSSArena *arena = NULL;
 
 #ifdef NSSDEBUG
   if( (void *)NULL != arena ) {