bug #36650 [Security] Fix bug introduced in entry_point configuration (…

…#36575) (wouterj)

This PR was merged into the 5.1-dev branch.

Discussion
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[Security] Fix bug introduced in entry_point configuration (#36575)

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Tickets       | -
| License       | MIT
| Doc PR        | -

Commits
-------

6978471 Fixed #36575

src/Symfony/Bundle/SecurityBundle/DependencyInjection/SecurityExtension.php

@@ -560,14 +560,12 @@ private function createAuthenticationListeners(ContainerBuilder $container, stri
         if ($entryPoints) {
             // we can be sure the authenticator system is enabled
             if (null !== $defaultEntryPoint) {
-                return $entryPoints[$defaultEntryPoint] ?? $defaultEntryPoint;
-            }
-
-            if (1 === \count($entryPoints)) {
-                return current($entryPoints);
+                $defaultEntryPoint = $entryPoints[$defaultEntryPoint] ?? $defaultEntryPoint;
+            } elseif (1 === \count($entryPoints)) {
+                $defaultEntryPoint = current($entryPoints);
+            } else {
+                throw new InvalidConfigurationException(sprintf('Because you have multiple authenticators in firewall "%s", you need to set the "entry_point" key to one of your authenticators (%s) or a service ID implementing "%s". The "entry_point" determines what should happen (e.g. redirect to "/login") when an anonymous user tries to access a protected page.', $id, implode(', ', $entryPoints), AuthenticationEntryPointInterface::class));
             }
-
-            throw new InvalidConfigurationException(sprintf('Because you have multiple authenticators in firewall "%s", you need to set the "entry_point" key to one of your authenticators (%s) or a service ID implementing "%s". The "entry_point" determines what should happen (e.g. redirect to "/login") when an anonymous user tries to access a protected page.', $id, implode(', ', $entryPoints), AuthenticationEntryPointInterface::class));
         }
 
         if (false === $hasListeners) {