Buildsystem/MSVC: Warning fixes

C4800 'type' : forcing value to bool 'true' or 'false' (performance warning)
C4127 conditional expression is constant

src/server/scripts/Spells/spell_dk.cpp

@@ -296,7 +296,7 @@ class spell_dk_blood_gorged : public SpellScriptLoader
             bool CheckProc(ProcEventInfo& /*eventInfo*/)
             {
                 _procTarget = GetTarget()->GetOwner();
-                return _procTarget;
+                return _procTarget != nullptr;
             }
 
             void HandleProc(AuraEffect const* aurEff, ProcEventInfo& eventInfo)