show tab nr condition moved to right place

autoload/airline/extensions/tabline.vim

@@ -243,10 +243,10 @@ function! s:get_tabs()
       let group = 'airline_tab'
     endif
     let val = '%('
+    if s:show_tab_nr
       if s:tab_nr_type == 0
         let val .= ' %{len(tabpagebuflist('.i.'))}'
       else
-      if s:show_tab_nr 
         let val .= (g:airline_symbols.space).i
       endif
     endif
@@ -264,4 +264,3 @@ function! s:get_tabs()
   let s:current_tabline = b.build()
   return s:current_tabline
 endfunction
-