pkgs/openwrt: ignore sysupgrade exit code in sshScript

nix/pkgs/openwrt/default.nix

@@ -27,7 +27,7 @@ in rec {
       #! ${pkgs.runtimeShell} -e
 
       ssh root@${address} "cat > /tmp/openwrt-image" < ${buildImage hostName}/openwrt-*-${hostName}-*-sysupgrade.bin
-      ssh root@${address} "sysupgrade -n /tmp/openwrt-image"
+      ssh root@${address} "sysupgrade -n /tmp/openwrt-image" || true
 
       # ssh hostkey will have changed after boot
       ssh-keygen -R ${address}