Remove an excess '&' from a comment

Signed-off-by: Andrew Clayton <andrew@digital-domain.net>
Remove redundant signal setup code

When setting up the signal handlers for SIGINT and SIGTERM, they want
the same setup, i.e same struct sigaction, so there's no need to do
the sigemptyset(3) etc twice.

Signed-off-by: Andrew Clayton <andrew@digital-domain.net>