Improve guard so it works for no eof new line

ftplugin/opencl.vim

@@ -1,4 +1,5 @@
 if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'opencl') == -1
+
 if exists("b:did_ftplugin") | finish | endif
 
 if version > 600
@@ -14,4 +15,5 @@ setlocal smarttab
 setlocal smartindent
 
 let b:did_ftplugin = 1
+
 endif