netifd: replace backticks by $(...)

This replaces deprecated backticks by more versatile $(...) syntax.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

package/network/config/netifd/files/etc/hotplug.d/net/20-smp-packet-steering

@@ -14,7 +14,7 @@ find_irq_cpu() {
 	[ -n "$match" ] && {
 		set -- $match
 		shift
-		for cur in `seq 1 $NPROCS`; do
+		for cur in $(seq 1 $NPROCS); do
 			[ "$1" -gt 0 ] && {
 				cpu=$(($cur - 1))
 				break

package/network/config/netifd/files/lib/network/config.sh

@@ -6,7 +6,7 @@
 find_config() {
 	local device="$1"
 	local ifdev ifl3dev ifobj
-	for ifobj in `ubus list network.interface.\*`; do
+	for ifobj in $(ubus list network.interface.\*); do
 		interface="${ifobj##network.interface.}"
 		(
 			json_load "$(ifstatus $interface)"

package/network/config/netifd/files/sbin/ifup

@@ -37,7 +37,7 @@ done
 
 [ "$modes" = "down up" ] && ubus call network reload
 if [ -n "$ifup_all" ]; then
-	for interface in `ubus -S list 'network.interface.*'`; do
+	for interface in $(ubus -S list 'network.interface.*'); do
 		if_call "${interface##network.interface.}"
 	done
 	[ -n "$setup_wifi" ] && /sbin/wifi up