Scripts/Hodir: Initialize variables

==9458== 1 errors in context 1 of 1:
==9458== Conditional jump or move depends on uninitialised value(s)
==9458==    at 0x1D2857B: boss_hodir::boss_hodirAI::DamageTaken(Unit*, unsigned int&) (boss_hodir.cpp:367)
==9458==    by 0x14A41E9: Unit::DealDamage(Unit*, unsigned int, CleanDamage const*, DamageEffectType, SpellSchoolMask, SpellInfo const*, bool) (Unit.cpp:562)
==9458==    by 0x1ABCEB3: misc_commandscript::HandleDamageCommand(ChatHandler*, char const*) (cs_misc.cpp:2138)