Win32: Initialize GHOST_WindowWin32 Members

Initialize m_Bar, m_dropTarget, & m_hWnd members of GHOST_WindowWin32
in constructor's member initializer list. This ensures they are are
set or NULL in destructor if constructor does not complete.

See D13886 for more details.

Differential Revision: https://developer.blender.org/D13886

Reviewed by Jesse Yurkovich

intern/ghost/intern/GHOST_WindowWin32.cpp

@@ -71,6 +71,8 @@ GHOST_WindowWin32::GHOST_WindowWin32(GHOST_SystemWin32 *system,
       m_mousePresent(false),
       m_inLiveResize(false),
       m_system(system),
+      m_dropTarget(NULL),
+      m_hWnd(0),
       m_hDC(0),
       m_isDialog(dialog),
       m_hasMouseCaptured(false),
@@ -78,6 +80,7 @@ GHOST_WindowWin32::GHOST_WindowWin32(GHOST_SystemWin32 *system,
       m_nPressedButtons(0),
       m_customCursor(0),
       m_wantAlphaBackground(alphaBackground),
+      m_Bar(NULL),
       m_wintab(NULL),
       m_lastPointerTabletData(GHOST_TABLET_DATA_NONE),
       m_normal_state(GHOST_kWindowStateNormal),