fix: check all results in erlang:system_info(check_io)

[JimMoen]

for OTP build without poll() and fallback to select()
the first check_io result will be primary type select(), and the max_fds was 1024.

> erlang:system_info(check_io).
[[{name,erts_poll},
  {primary,select},
  {kernel_poll,false},
  {memory_size,13448},
  {total_poll_set_size,1},
  {lazy_updates,true},
  {pending_updates,0},
  {batch_updates,false},
  {concurrent_updates,false},
  {fallback,true},
  {max_fds,1024},
  {active_fds,0},
  {poll_threads,0}],
 [{name,erts_poll},
  {primary,epoll},
  {kernel_poll,epoll},
  {memory_size,56},
  {total_poll_set_size,5},
  {lazy_updates,false},
  {pending_updates,0},
  {batch_updates,false},
  {concurrent_updates,true},
  {fallback,false},
  {max_fds,1048576},
  {active_fds,0},
  {poll_threads,0}],
 [{name,erts_poll},
  {primary,epoll},
  {kernel_poll,epoll},
  {memory_size,57400},
  {total_poll_set_size,32},
  {lazy_updates,false},
  {pending_updates,0},
  {batch_updates,false},
  {concurrent_updates,true},
  {fallback,false},
  {max_fds,1048576},
  {active_fds,0},
  {poll_threads,4}]]