Core: Fix some warnings

src/server/game/Entities/Unit/Unit.cpp

@@ -1648,8 +1648,6 @@ void Unit::CalcAbsorbResist(Unit *pVictim, SpellSchoolMask schoolMask, DamageEff
         if (!(absorbAurEff->GetMiscValue() & schoolMask))
             continue;
 
-        SpellEntry const * spellProto = absorbAurEff->GetSpellProto();
-
         // get amount which can be still absorbed by the aura
         int32 currentAbsorb = absorbAurEff->GetAmount();
         // aura with infinite absorb amount - let the scripts handle absorbtion amount, set here to 0 for safety