Core/Misc: Fix static analysis issues

src/server/game/Spells/Spell.cpp

@@ -524,6 +524,7 @@ m_caster((info->HasAttribute(SPELL_ATTR6_CAST_BY_CHARMER) && caster->GetCharmerO
     m_referencedFromCurrentSpell = false;
     m_executedCurrently = false;
     m_needComboPoints = m_spellInfo->NeedsComboPoints();
+    m_comboTarget = nullptr;
     m_comboPointGain = 0;
     m_delayStart = 0;
     m_delayAtDamageCount = 0;