nixos/initrd-network: always run postCommands

As outlined in #71447, postCommands should always be run if networking
in initrd is enabled. regardless if the configuration actually
succeeded.

nixos/modules/system/boot/initrd-network.nix

@@ -113,8 +113,7 @@ in
         for o in $(cat /proc/cmdline); do
           case $o in
             ip=*)
-              ipconfig $o && hasNetwork=1 \
-                && ifaces="$ifaces $(echo $o | cut -d: -f6)"
+              ipconfig $o && ifaces="$ifaces $(echo $o | cut -d: -f6)"
               ;;
           esac
         done
@@ -122,8 +121,6 @@ in
 
       # Otherwise, use DHCP.
       + optionalString doDhcp ''
-        if [ -z "$hasNetwork" ]; then
-
         # Bring up all interfaces.
         for iface in ${dhcpIfShellExpr}; do
           echo "bringing up network interface $iface..."
@@ -133,17 +130,11 @@ in
         # Acquire DHCP leases.
         for iface in ${dhcpIfShellExpr}; do
           echo "acquiring IP address via DHCP on $iface..."
-            udhcpc --quit --now -i $iface -O staticroutes --script ${udhcpcScript} ${udhcpcArgs} && hasNetwork=1
+          udhcpc --quit --now -i $iface -O staticroutes --script ${udhcpcScript} ${udhcpcArgs}
         done
-        fi
       ''
 
-      + ''
-        if [ -n "$hasNetwork" ]; then
-          echo "networking is up!"
-          ${cfg.postCommands}
-        fi
-      '');
+      + cfg.postCommands);
 
     boot.initrd.postMountCommands = mkIf cfg.flushBeforeStage2 ''
       for iface in $ifaces; do