uqmi: do not block proto handler if modem is unable to registrate

QMI proto setup-handler will wait forever if it is unable to registrate to
the mobile network. To fix this stop polling network registration status
and notify netifd. Netifd will generate then a "ifup-failed" ACTION.

Signed-off-by: Florian Eckert <fe@dev.tdt.de>

package/network/utils/uqmi/files/lib/netifd/proto/qmi.sh

@@ -123,9 +123,18 @@ proto_qmi_setup() {
 	uqmi -s -d "$device" --sync > /dev/null 2>&1
 
 	echo "Waiting for network registration"
+	local registration_timeout=0
 	while uqmi -s -d "$device" --get-serving-system | grep '"searching"' > /dev/null; do
 		[ -e "$device" ] || return 1
-		sleep 5;
+		if [ "$registration_timeout" -lt "$timeout" ]; then
+			let registration_timeout++
+			sleep 1;
+		else
+			echo "Network registration failed"
+			proto_notify_error "$interface" NETWORK_REGISTRATION_FAILED
+			proto_block_restart "$interface"
+			return 1
+		fi
 	done
 
 	[ -n "$modes" ] && uqmi -s -d "$device" --set-network-modes "$modes" > /dev/null 2>&1