Improve guard so it works for no eof new line

syntax/xsl.vim

@@ -1,4 +1,5 @@
 if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'xls') == -1
+
 " Vim syntax file
 " Language:	XSLT 1.0
 " with HTML, CSS, JavaScript, PerlScript, VBScript and MSXSL extention
@@ -536,4 +537,5 @@ let b:current_syntax = "xsl"
 "unlet s:xml_cpo_save
 
 " vim: ts=4:sw=4
+
 endif