fixed parse error for last comma in arglist

Author: ynkdir

autoload/vimlparser.vim

@@ -3047,6 +3047,11 @@ function! s:ExprParser.parse_expr8()
           call add(node.rlist, self.parse_expr1())
           let token = self.tokenizer.get()
           if token.type == s:TOKEN_COMMA
+            " TODO: Vim allows foo(a, b, ).  Lint should be warn it.
+            if self.tokenizer.peek().type == s:TOKEN_PCLOSE
+              call self.tokenizer.get()
+              break
+            endif
           elseif token.type == s:TOKEN_PCLOSE
             break
           else