Fixing few small problems in SET PASSWORD:

* comparison with correct cached variable
* preventing check_change_password to be called twice, once from 
  set_var::check and the other time from change_password itself

mysql-test/r/select_safe.result

@@ -30,7 +30,7 @@ You are using safe update mode and you tried to update a table without a WHERE t
 delete from t1 where a+0=1;
 You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column
 select 1 from t1,t1 as t2,t1 as t3,t1 as t4,t1 as t5;
-The SELECT would examine too many records and probably take a very long time. Check your WHERE and use SET OPTION SQL_BIG_SELECTS=1 if the SELECT is ok
+The SELECT would examine too many records and probably take a very long time. Check your WHERE and use SET SQL_BIG_SELECTS=1 if the SELECT is ok
 update t1 set b="a" limit 1;
 update t1 set b="a" where b="b" limit 2;
 delete from t1 where b="test" limit 1;

sql/sql_acl.cc

@@ -1029,7 +1029,7 @@ bool check_change_password(THD *thd, const char *host, const char *user)
   }
   if (!thd->slave_thread &&
       (strcmp(thd->user,user) ||
-       my_strcasecmp(host,thd->host ? thd->host : thd->ip)))
+       my_strcasecmp(host,thd->host_or_ip)))
   {
     if (check_access(thd, UPDATE_ACL, "mysql",0,1))
       return(1);
@@ -1067,10 +1067,6 @@ bool change_password(THD *thd, const char *host, const char *user,
 		      host,user,new_password));
   DBUG_ASSERT(host != 0);			// Ensured by parent
 
-  if (check_change_password(thd, host, user))
-    DBUG_RETURN(1);
-
-  /* password should always be 0 or 16 chars; simple hack to avoid cracking */
   length=(uint) strlen(new_password);
   new_password[length & 16]=0;