Address SessionLimitStrategy

Closes gh-16206

Author: claudenirmachado

config/src/main/java/org/springframework/security/config/annotation/web/configurers/SessionManagementConfigurer.java

@@ -571,9 +571,7 @@ private SessionAuthenticationStrategy getSessionAuthenticationStrategy(H http) {
 			SessionRegistry sessionRegistry = getSessionRegistry(http);
 			ConcurrentSessionControlAuthenticationStrategy concurrentSessionControlStrategy = new ConcurrentSessionControlAuthenticationStrategy(
 					sessionRegistry);
-			if (this.sessionLimit != null) {
-				concurrentSessionControlStrategy.setMaximumSessions(this.sessionLimit);
-			}
+			concurrentSessionControlStrategy.setMaximumSessions(this.sessionLimit);
 			concurrentSessionControlStrategy.setExceptionIfMaximumExceeded(this.maxSessionsPreventsLogin);
 			concurrentSessionControlStrategy = postProcess(concurrentSessionControlStrategy);
 			RegisterSessionAuthenticationStrategy registerSessionStrategy = new RegisterSessionAuthenticationStrategy(