network: drop carrier check for unmanaged interface from link_is_ready_to_configure()

Preparation for later commits. No functional change.

src/network/networkd-link.c

@@ -98,12 +98,8 @@ bool link_is_ready_to_configure(Link *link, bool allow_unmanaged) {
         if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED, LINK_STATE_UNMANAGED))
                 return false;
 
-        if (!link->network) {
-                if (!allow_unmanaged)
-                        return false;
-
-                return link_has_carrier(link);
-        }
+        if (!link->network)
+                return allow_unmanaged;
 
         if (!link->network->configure_without_carrier) {
                 if (link->set_flags_messages > 0)

src/network/networkd-route.c

@@ -1298,7 +1298,8 @@ static int route_is_ready_to_configure(const Route *route, Link *link) {
                 if (r < 0)
                         return false;
                 if (r > 0) {
-                        if (!link_is_ready_to_configure(l, true))
+                        if (!link_is_ready_to_configure(l, /* allow_unmanaged = */ true) ||
+                            !link_has_carrier(l))
                                 return false;
 
                         m->ifindex = l->ifindex;