[opw-web] Fix compatibility with older PHP

[Owen Taylor <otaylor src gnome org>]

commit f5c48ba0285d2d01f9edb116ed6a9db581c4df65
Author: Owen W. Taylor <otaylor fishsoup net>
Date:   Mon Mar 10 09:41:44 2014 -0400

    Fix compatibility with older PHP

 classes/class_db.php |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/classes/class_db.php b/classes/class_db.php
index 3bdce45..a38e8a1 100644
--- a/classes/class_db.php
+++ b/classes/class_db.php
@@ -107,7 +107,8 @@ class db
                 if (!$result)
                 {
                     $title    = 'Database error';
-                    $message  = "Error: {$statement->errorInfo()[2]}<br />";
+                    $error_info = $statement->errorInfo();
+                    $message  = "Error: {$error_info[2]}<br />";
                     $message .= "Whole query: {$sql}";
                     $gsod->trigger($title, $message);
                 }
@@ -128,7 +129,8 @@ class db
                 if (!$result)
                 {
                     $title    = 'Database error';
-                    $message  = "Error: {$statement->errorInfo()[2]}<br />";
+                    $error_info = $statement->errorInfo();
+                    $message  = "Error: {$error_info[2]}<br />";
                     $message .= "Whole query: {$sql}";
                     $gsod->trigger($title, $message);
                 }