Add missing trailing \n in log_err/info()

Callers need trailing \n in case of fwrite(3) (if not syslog(3)).

These are the ones that seem to need trailing \n not followed
by another log function call as consequence.

Signed-off-by: Tomohiro Kusumi <tkusumi@tuxera.com>
Signed-off-by: Jens Axboe <axboe@fb.com>