check of ACL initialization in is_acl_user() (BUG#13504)

mysql-test/r/skip_grants.result:
  creation view with DEFINER clause if --skip-grant-tables
mysql-test/t/skip_grants.test:
  creation view with DEFINER clause if --skip-grant-tables
sql/sql_acl.cc:
  check of ACL initialization in is_acl_user()

mysql-test/r/skip_grants.result

@@ -8,3 +8,7 @@ ERROR HY000: View definer is not fully qualified
 drop table t1;
 create procedure f1() select 1;
 drop procedure f1;
+create table t1 (a int);
+create definer='user'@'host' sql security definer view v1 as select * from t1;
+drop view v1;
+drop table t1;

mysql-test/t/skip_grants.test

@@ -19,3 +19,11 @@ drop table t1;
 #
 create procedure f1() select 1;
 drop procedure f1;
+
+#
+# BUG#13504: creation view with DEFINER clause if --skip-grant-tables
+#
+create table t1 (a int);
+create definer='user'@'host' sql security definer view v1 as select * from t1;
+drop view v1;
+drop table t1;

sql/sql_acl.cc

@@ -1487,6 +1487,11 @@ bool change_password(THD *thd, const char *host, const char *user,
 bool is_acl_user(const char *host, const char *user)
 {
   bool res;
+
+  /* --skip-grants */
+  if (!initialized)
+    return TRUE;
+
   VOID(pthread_mutex_lock(&acl_cache->lock));
   res= find_acl_user(host, user, TRUE) != NULL;
   VOID(pthread_mutex_unlock(&acl_cache->lock));