ReleaseDC on success

Author: radarhere

src/display.c

@@ -433,7 +433,11 @@ PyImaging_GrabScreenWin32(PyObject *self, PyObject *args) {
 
     DeleteObject(bitmap);
     DeleteDC(screen_copy);
-    DeleteDC(screen);
+    if (screens == -1) {
+        ReleaseDC(wnd, screen);
+    } else {
+        DeleteDC(screen);
+    }
 
     return Py_BuildValue("(ii)(ii)N", x, y, width, height, buffer);