Core: Corrected NULL usage, it should only be used with pointers, not integers

src/server/scripts/Outland/CoilfangReservoir/SerpentShrine/boss_fathomlord_karathress.cpp

@@ -293,7 +293,7 @@ public:
                 if (continueTriggering)
                 {
                     DoCast(me, SPELL_BLESSING_OF_THE_TIDES);
-                    me->MonsterYell(SAY_GAIN_BLESSING_OF_TIDES, LANG_UNIVERSAL, NULL);
+                    me->MonsterYell(SAY_GAIN_BLESSING_OF_TIDES, LANG_UNIVERSAL, 0);
                     DoPlaySoundToSet(me, SOUND_GAIN_BLESSING_OF_TIDES);
                 }
             }

src/server/scripts/Outland/CoilfangReservoir/SerpentShrine/boss_hydross_the_unstable.cpp

@@ -305,7 +305,7 @@ public:
                 {
                     if (MarkOfHydross_Count <= 5)
                     {
-                        uint32 mark_spell = NULL;
+                        uint32 mark_spell = 0;
 
                         switch(MarkOfHydross_Count)
                         {