Improve guard so it works for no eof new line

syntax/zig.vim

@@ -1,4 +1,5 @@
 if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'zig') == -1
+
 " Vim syntax file
 " Language: Zig
 " Maintainer: Andrew Kelley
@@ -102,4 +103,5 @@ hi def link zigStructure Structure
 hi def link zigStatement Statement
 hi def link zigConditional Conditional
 hi def link zigRepeat Repeat
+
 endif