Unbreak syslogd after r310494

Don't close all file descriptors greater than STDERR_FILENO (2) in
waitdaemon(..) -- only close fd (file descriptor for /dev/null used in
subsequent calls to dup2) if it's greater than STDERR_FILENO.

Reported by: subbsd@gmail.com, danny@cs.huji.ac.il
Pointyhat to: hrs
X-MFC with: r310494