Correct quickfix window detection pattern

autoload/airline/extensions/quickfix.vim

@@ -24,7 +24,7 @@ function! s:get_text()
 
   let nr = bufnr('%')
   for buf in split(buffers, '\n')
-    if match(buf, '\v^\s+'.nr) > -1
+    if match(buf, '\v^\s*'.nr) > -1
       if match(buf, '\[Quickfix List\]') > -1
         return g:airline#extensions#quickfix#quickfix_text
       else