Initialize new VertexBuffer / IndexBuffer variable for completeness.

Source/Urho3D/Graphics/IndexBuffer.cpp

@@ -43,7 +43,8 @@ IndexBuffer::IndexBuffer(Context* context, bool forceHeadless) :
     lockCount_(0),
     lockScratchData_(0),
     shadowed_(false),
-    dynamic_(false)
+    dynamic_(false),
+    discardLock_(false)
 {
     // Force shadowing mode if graphics subsystem does not exist
     if (!graphics_)

Source/Urho3D/Graphics/VertexBuffer.cpp

@@ -43,7 +43,8 @@ VertexBuffer::VertexBuffer(Context* context, bool forceHeadless) :
     lockCount_(0),
     lockScratchData_(0),
     shadowed_(false),
-    dynamic_(false)
+    dynamic_(false),
+    discardLock_(false)
 {
     UpdateOffsets();