script: multiap: don't invoke wpa_cli with empty ifname

Causes it to get stuck when using global wpa_supplicant

src/script/multiap

@@ -50,6 +50,8 @@ type_to_multi_ap () {
 
 get_network_id() {
 	local ifname=$1
+
+	[ -n "$ifname" ] || return
 	network_id=$(wpa_cli -i $ifname list_n|tail -n 1 | awk '{print $1}')
 	echo ${network_id}
 }
@@ -71,6 +73,8 @@ setup_conf() {
 bsta_disable() {
 	local ifname=$1
 
+	[ -n "$ifname" ] || return
+
 	network_id=$(get_network_id $ifname)
 	wpa_cli -i "$ifname" disconnect > /dev/console
 	wpa_cli -i "$ifname" disable_network $network_id > /dev/console
@@ -283,6 +287,8 @@ set_network_bssid() {
 	local bssid=$2
 	local network_id=$(get_network_id $ifname)
 
+	[ -n "$ifname" ] || return
+
 	wpa_cli -i $ifname set_n $network_id bssid $bssid
 }
 
@@ -291,6 +297,8 @@ bsta_steer() {
 	local bssid=$2
 	local network_id=$(get_network_id $ifname)
 
+	[ -n "$ifname" ] || return
+
 	rc=$(wpa_cli -i $ifname set_n $network_id bssid $bssid)
 	[ "$rc" == "FAIL" ] && {
 		echo "1"
@@ -357,6 +365,9 @@ write_bsta_config() {
 			[ "$old_bssid" == "$bssid" ] && break
 
 			uci -q set wireless.${section}.bssid=$bssid
+
+			[ -n "$ifname" ] || return
+
 			network_id=$(get_network_id $bsta)
 			wpa_cli -i "$bsta" set_n $network_id bssid $bssid
 			wpa_cli -i "$bsta" save_config
@@ -535,6 +546,8 @@ bsta_to_wireless() {
 
 				[ "$disabled" != "1" ] && return
 
+				[ -n "$ifname" ] || return
+
 				network_id=$(get_network_id $ifname)
 				wpa_cli -i "$bsta" disconnect > /dev/null 2>&1
 				wpa_cli -i "$bsta" disable_network $network_id > /dev/null 2>&1
@@ -722,6 +735,8 @@ bsta_scan_on_enabled() {
 		do
 			[ "$onboarded_band" != "$band" ] && continue
 
+			[ -n "$ifname" ] || return
+
 			network_id=$(get_network_id $ifname)
 			logger -t multiap "bsta_scan_on_enabled $ifname $band id ${network_id}"
 			wpa_cli -i "$ifname" enable_network $network_id > /dev/null 2>&1
@@ -774,6 +789,8 @@ bsta_clear_bssid() {
 
 		[ -n "$iface" -a "$iface" != "$ifname" ] && return
 
+		[ -n "$ifname" ] || return
+
 		network_id=$(get_network_id $ifname)
 		uci -q del wireless.$1.bssid
 		wpa_cli -i "$ifname" bssid $network_id 00:00:00:00:00:00 > /dev/null 2>&1
@@ -795,6 +812,8 @@ bsta_blacklist_bssid_set() {
 	shift
 	local bssid="$@"
 
+	[ -n "$ifname" ] || return
+
 	network_id=$(get_network_id $ifname)
 
 	wpa_cli -i "$ifname" set_network $network_id bssid_ignore "$bssid" > /dev/null 2>&1
@@ -805,6 +824,8 @@ bsta_blacklist_bssid_clear() {
 	mapagent_blacklist_by_band() {
 		config_get ifname $1 ifname
 
+		[ -n "$ifname" ] || return
+
 		network_id=$(get_network_id $ifname)
 
 		wpa_cli -i "$ifname" set_network $network_id bssid_ignore "" > /dev/null 2>&1
@@ -841,6 +862,8 @@ bsta_disable_lower_priority() {
 
 				[ "$enabled" != "0" ] && return
 
+				[ -n "$ifname" ] || return
+
 				network_id=$(get_network_id $ifname)
 				wpa_cli -i "$ifname" disconnect > /dev/null 2>&1
 				wpa_cli -i "$ifname" disable_network $network_id > /dev/null 2>&1
@@ -892,6 +915,8 @@ bsta_use_link() {
 
 		[ "$bsta" = "$ifname" ] && return
 
+		[ -n "$ifname" ] || return
+
 		network_id=$(get_network_id $ifname)
 		wpa_cli -i "$ifname" disconnect > /dev/null 2>&1
 		wpa_cli -i "$ifname" disable_network $network_id > /dev/null 2>&1
@@ -904,6 +929,10 @@ bsta_use_link() {
 }
 
 bsta_swap_to_link() {
+	local ifname=$1
+
+	[ -n "$ifname" ] || return
+
 	bsta_disable_lower_priority $1
 	bsta_use_link $1
 
@@ -1065,6 +1094,8 @@ db_get() {
 bsta_scan() {
 	ifname=$1
 
+	[ -n "$ifname" ] || return
+
 	network_id=$(get_network_id $ifname)
 
 	logger -t multiap "bsta_scan $ifname id ${network_id}"