Update document.lib.php

Changed as per comment by @AngelFQC

main/inc/lib/document.lib.php

@@ -299,7 +299,7 @@ class DocumentManager
 	if (!file_exists($full_file_name))
 	{
 		header ("HTTP/1.1 404 Not Found");
-		return;
+		return false;
 	}
 	
 	$size	= filesize($full_file_name);
@@ -309,7 +309,7 @@ class DocumentManager
 	if (!$fm)
 	{
 		header ("HTTP/1.1 505 Internal server error");
-		return;
+		return false;
 	}
 	
 	$begin	= 0;
@@ -463,7 +463,7 @@ class DocumentManager
 				case 'video/ogg':
 				case 'video/webm':		
 					self::smartReadFile($full_file_name,$filename,$contentType);
-					break;
+					exit;
                 case 'application/vnd.dwg':
                 case 'application/vnd.dwf':
                     header('Content-type: application/octet-stream');