atftpd: Refactor init script

- Add local variables for read configuration
- Convert uppercase  to lowercase for local variables

Signed-off-by: Jakub Raczynski <myszsoda@gmail.com>

net/atftp/files/atftpd.init

@@ -5,11 +5,15 @@ START=95
 PIDFILE=/tmp/run/atftpd.pid
 
 start() {
-	config_load atftpd
-	config_get SRV service path "/srv/tftp"
-	config_get PORT service port 69
+	local srv
+	local port
 
-	atftpd --pidfile $PIDFILE --user root.root --port $PORT --daemon $SRV
+	config_load atftpd
+
+	config_get srv service path "/srv/tftp"
+	config_get port service port 69
+
+	atftpd --pidfile $PIDFILE --user root.root --port $port --daemon $srv
 }
 
 stop() {