nixos/switch-to-configuration: Use early return

nixos/modules/system/activation/switch-to-configuration.pl

@@ -190,12 +190,16 @@ sub handleModifiedUnit {
                     }
                 }
             }
+
             # Don't do the rest of this for socket-activated units
             # because we handled these above where we stop the unit.
             # Since only services can be socket-activated, the
             # following condition always evaluates to `true` for
             # non-service units.
-            if (!$socketActivated) {
+            if ($socketActivated) {
+                return;
+            }
+
             # If we are restarting a socket, also stop the corresponding
             # service. This is required because restarting a socket
             # when the service is already activated fails.
@@ -229,7 +233,6 @@ sub handleModifiedUnit {
         }
     }
 }
-}
 
 # Figure out what units need to be stopped, started, restarted or reloaded.
 my (%unitsToStop, %unitsToSkip, %unitsToStart, %unitsToRestart, %unitsToReload);