Core: Fix many "errors"/warnings and coding style (3)

Game

Errors were found using Cppcheck, open-source static analysis tool

src/server/game/Entities/GameObject/GameObject.cpp

@@ -1418,7 +1418,8 @@ void GameObject::Use(Unit* user)
             // full amount unique participants including original summoner
             if (GetUniqueUseCount() == info->summoningRitual.reqParticipants)
             {
-                spellCaster = m_ritualOwner ? m_ritualOwner : spellCaster;
+                if (m_ritualOwner)
+                    spellCaster = m_ritualOwner;
 
                 spellId = info->summoningRitual.spellId;