[broker-11] fix for code review

Author: JavaSaBr

src/main/java/com/ss/mqtt/broker/service/impl/InMemoryClientIdRegistry.java

@@ -41,9 +41,8 @@ public InMemoryClientIdRegistry(@NotNull String availableChars, int maxClientIdL
                 return false;
             } else {
                 dictionary.put(id, CLIENT_ID_VALUE);
+                return true;
             }
-
-            return true;
         });
 
         //noinspection ConstantConditions