logging: fs: fix leak of opened directories in check_log_file_exist()

Opened directory descriptor is leaked when returning 1. Fix that by
utilizing goto in function return path.

Fixes: 6b18e699 ("subsys/loggin/log_backend_fs: added recovery after
  file lost")
Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com>