Move PHP session into captcha code to prevent unnecessary cookies.

post.php

@@ -169,9 +169,12 @@ elseif (isset($_GET['Newsgroups'])) {
 	error("NNTPChan: NNTPChan support is disabled");
 }
 
-session_start();
-if (!isset($_POST['captcha_cookie']) && isset($_SESSION['captcha_cookie'])) {
-	$_POST['captcha_cookie'] = $_SESSION['captcha_cookie'];
+// Create session cookie if not already done and captchas are enabled
+if ($config['captcha']['enabled'] || $config['report_captcha']) {
+	session_start();
+	if (!isset($_POST['captcha_cookie']) && isset($_SESSION['captcha_cookie'])) {
+		$_POST['captcha_cookie'] = $_SESSION['captcha_cookie'];
+	}
 }
 
 if (isset($_POST['delete'])) {
@@ -338,7 +341,7 @@ if (isset($_POST['delete'])) {
 			$resp = curl_exec($ch);
 
 			if ($resp !== '1') {
-		                    error($config['error']['captcha']);
+				error($config['error']['captcha']);
 			}
 		}
 	}
@@ -454,7 +457,7 @@ if (isset($_POST['delete'])) {
 				$resp = curl_exec($ch);
 
 				if ($resp !== '1') {
-				                error($config['error']['captcha'] .
+					error($config['error']['captcha'] .
 					'<script>if (actually_load_captcha !== undefined) actually_load_captcha("'.$config['captcha']['provider_get'].'", "'.$config['captcha']['extra'].'");</script>');
 				}
 			}