add -p so that there is not an error if existing

debian/resources/switch/source/freeswitch.service.package

@@ -14,7 +14,7 @@ Environment="DAEMON_OPTS=-nonat"
 Environment="USER=www-data"
 Environment="GROUP=www-data"
 EnvironmentFile=-/etc/default/freeswitch
-ExecStartPre=mkdir /var/run/freeswitch
+ExecStartPre=mkdir -p /var/run/freeswitch
 ExecStartPre=/bin/chown -R ${USER}:${GROUP} /var/lib/freeswitch /var/log/freeswitch /etc/freeswitch /usr/share/freeswitch /var/run/freeswitch
 ExecStart=/usr/bin/freeswitch -u ${USER} -g ${GROUP} -ncwait ${DAEMON_OPTS}
 TimeoutSec=45s