Minor tweaking of ENOSPC test
Minor tweaking of ENOSPC test

Check that unlink() is not called on errno other than ENOSPC

jjneely/whisper,deniszh/whisper,graphite-server/whisper,alexandreboisvert/whisper,penpen/whisper,piotr1212/whisper,akbooer/whisper,kerlandsson/whisper,obfuscurity/whisper,graphite-project/whisper,cbowman0/whisper