fixed sql error on `create_user()` with `use_password_hash`-config_var on __true__

application/libraries/Aauth.php

@@ -712,12 +712,12 @@ class Aauth {
 			}
 
 			// Update to correct salted password
-			$data = null;
 			if( !$this->config_vars['use_password_hash']){
+				$data = null;
 				$data['pass'] = $this->hash_password($pass, $user_id);
-			}
 				$this->aauth_db->where('id', $user_id);
 				$this->aauth_db->update($this->config_vars['users'], $data);
+			}
 
 			return $user_id;