Reverting changes to functions that have no business being used in CLI apps to begin with

Signed-off-by: Daniel Hunsaker <danhunsaker@gmail.com>
diff --git a/system/libraries/Trackback.php b/system/libraries/Trackback.php
index ecc7129..5a45be8 100644
--- a/system/libraries/Trackback.php
+++ b/system/libraries/Trackback.php
@@ -211,8 +211,7 @@
 	 */
 	public function send_error($message = 'Incomplete Information')
 	{
-		echo '<?xml version="1.0" encoding="utf-8"?'.">\n<response>\n<error>1</error>\n<message>".$message."</message>\n</response>";
-		exit;
+		exit('<?xml version="1.0" encoding="utf-8"?'.">\n<response>\n<error>1</error>\n<message>".$message."</message>\n</response>");
 	}
 
 	// --------------------------------------------------------------------
@@ -227,8 +226,7 @@
 	 */
 	public function send_success()
 	{
-		echo '<?xml version="1.0" encoding="utf-8"?'.">\n<response>\n<error>0</error>\n</response>";
-		exit;
+		exit('<?xml version="1.0" encoding="utf-8"?'.">\n<response>\n<error>0</error>\n</response>");
 	}
 
 	// --------------------------------------------------------------------