mac80211: remove error from detect script

Signed-off-by: Michel Stam <m.stam@fugro.nl>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@42861 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/kernel/mac80211/files/lib/wifi/mac80211.sh

@@ -19,9 +19,11 @@ lookup_phy() {
 
 	local macaddr="$(config_get "$device" macaddr | tr 'A-Z' 'a-z')"
 	[ -n "$macaddr" ] && {
-		for _phy in $(ls /sys/class/ieee80211 2>/dev/null); do
-			[ "$macaddr" = "$(cat /sys/class/ieee80211/${_phy}/macaddress)" ] || continue
-			phy="$_phy"
+		for _phy in /sys/class/ieee80211/*; do
+			[ -e "$_phy" ] || continue
+
+			[ "$macaddr" = "$(cat ${_phy}/macaddress)" ] || continue
+			phy="${_phy##*/}"
 			return
 		done
 	}
@@ -65,7 +67,12 @@ detect_mac80211() {
 		[ -n "$type" ] || break
 		devidx=$(($devidx + 1))
 	done
-	for dev in $(ls /sys/class/ieee80211); do
+
+	for _dev in /sys/class/ieee80211/*; do
+		[ -e "$_dev" ] || continue
+
+		dev="${_dev##*/}"
+
 		found=0
 		config_foreach check_mac80211_device wifi-device
 		[ "$found" -gt 0 ] && continue