Fix typo

Author: mattn

autoload/lsp.vim

@@ -160,7 +160,7 @@ function! s:on_text_document_did_save() abort
     let l:buf = bufnr('%')
     call lsp#log('s:on_text_document_did_save()', l:buf)
     for l:server_name in lsp#get_whitelisted_servers()
-        call s:ensure_flush(:buf, l:server_name, {result->s:call_did_save(l:buf, l:server_name, result, function('s:Noop'))})
+        call s:ensure_flush(l:buf, l:server_name, {result->s:call_did_save(l:buf, l:server_name, result, function('s:Noop'))})
     endfor
 endfunction