Fix some compilation errors due to warnings of potentially returning unitialized variables. (#5796)

Signed-off-by: moraaar <moraaar@amazon.com>

Gems/EMotionFX/Code/MCore/Source/Algorithms.cpp

@@ -293,7 +293,7 @@ namespace MCore
     // check if the test point is inside the polygon
     AZ::Vector2 ClosestPointToPoly(const AZ::Vector2* polyPoints, size_t numPoints, const AZ::Vector2& testPoint)
     {
-        AZ::Vector2 result;
+        AZ::Vector2 result = AZ::Vector2::CreateZero();
         float closestDist = FLT_MAX;
         for (size_t i = 0; i < numPoints; ++i)
         {

Gems/LyShine/Code/Source/Draw2d.cpp

@@ -497,7 +497,7 @@ void CDraw2d::SetSortKey(int64_t key)
 AZ::Vector2 CDraw2d::Align(AZ::Vector2 position, AZ::Vector2 size,
     HAlign horizontalAlignment, VAlign verticalAlignment)
 {
-    AZ::Vector2 result;
+    AZ::Vector2 result = AZ::Vector2::CreateZero();
     switch (horizontalAlignment)
     {
     case HAlign::Left:

Gems/LyShine/Code/Source/UiTextComponent.cpp

@@ -4936,7 +4936,7 @@ AZStd::string UiTextComponent::GetLocalizedText([[maybe_unused]] const AZStd::st
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 AZ::Vector2 UiTextComponent::CalculateAlignedPositionWithYOffset(const UiTransformInterface::RectPoints& points)
 {
-    AZ::Vector2 pos;
+    AZ::Vector2 pos = AZ::Vector2::CreateZero();
     const DrawBatchLines& drawBatchLines = GetDrawBatchLines();
     size_t numLinesOfText = drawBatchLines.batchLines.size();
 

Gems/ScriptCanvas/Code/Editor/View/Widgets/DataTypePalette/DataTypePaletteModel.cpp

@@ -200,7 +200,7 @@ namespace ScriptCanvasEditor
     
     AZ::TypeId DataTypePaletteModel::FindTypeIdForIndex(const QModelIndex& index) const
     {   
-        AZ::TypeId retVal;
+        AZ::TypeId retVal = AZ::TypeId::CreateNull();
 
         if (index.row() >= 0 && index.row() < m_variableTypes.size())
         {