taskmgr: Avoid return type when the return value is not used.

programs/taskmgr/graphctl.c

@@ -153,13 +153,12 @@ static void GraphCtrl_Resize(TGraphCtrl* this)
     this->m_dVerticalFactor = (double)this->m_nPlotHeight / this->m_dRange;
 }
 
-BOOL GraphCtrl_Create(TGraphCtrl* this, HWND hWnd, HWND hParentWnd, UINT nID)
+void GraphCtrl_Create(TGraphCtrl* this, HWND hWnd, HWND hParentWnd, UINT nID)
 {
     GraphCtrl_Init(this);
     this->m_hParentWnd = hParentWnd;
     this->m_hWnd = hWnd;
     GraphCtrl_Resize(this);
-    return 0;
 }
 
 static void GraphCtrl_InvalidateCtrl(TGraphCtrl* this)

programs/taskmgr/graphctl.h

@@ -89,8 +89,7 @@ extern WNDPROC OldGraphCtrlWndProc;
 double  GraphCtrl_AppendPoint(TGraphCtrl* this, 
                               double dNewPoint0, double dNewPoint1,
                               double dNewPoint2, double dNewPoint3);
-BOOL    GraphCtrl_Create(TGraphCtrl* this, HWND hWnd, HWND hParentWnd, 
-UINT nID);
+void    GraphCtrl_Create(TGraphCtrl* this, HWND hWnd, HWND hParentWnd, UINT nID);
 void    GraphCtrl_Reset(TGraphCtrl* this);
 void    GraphCtrl_SetBackgroundColor(TGraphCtrl* this, COLORREF 
 color);