Improve guard so it works for no eof new line

indent/glsl.vim

@@ -1,4 +1,5 @@
 if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'glsl') == -1
+
 " Language: OpenGL Shading Language
 " Maintainer: Sergey Tikhomirov <sergey@tikhomirov.io>
 
@@ -10,4 +11,5 @@ setlocal autoindent cindent
 setlocal formatoptions+=roq
 
 " vim:set sts=2 sw=2 :
+
 endif