Use is_wired_interface() instead of hard-coded interface device

names.

Pointed out by:	sam

etc/rc.d/rtadvd

@@ -9,6 +9,7 @@
 # KEYWORD: nojail shutdown
 
 . /etc/rc.subr
+. /etc/network.subr
 
 name="rtadvd"
 rcvar=`set_rcvar`
@@ -42,29 +43,9 @@ rtadvd_precmd()
 	case ${rtadvd_interfaces} in
 	[Aa][Uu][Tt][Oo]|'')
 		for i in `ifconfig -l` ; do
-			case $i in
-			lo0|\
-			stf[0-9]*|\
-			faith[0-9]*|\
-			lp[0-9]*|\
-			sl[0-9]*|\
-			pflog[0-9]*|\
-			pfsync[0-9]*|\
-			an[0-9]*|\
-			ath[0-9]*|\
-			ipw[0-9]*|\
-			iwi[0-9]*|\
-			iwn[0-9]*|\
-			ral[0-9]*|\
-			wi[0-9]*|\
-			wl[0-9]*|\
-			wpi[0-9]*)
-				continue
-				;;
-			*)
+			if is_wired_interface $1; then
 				rtadvd_interfaces="${rtadvd_interfaces} ${i}"
-				;;
-			esac
+			fi
 		done
 		;;
 	esac