gdi32/tests: Test the return value of GetClipBox before trying to access the rect.

dlls/gdi32/tests/metafile.c

@@ -1953,8 +1953,11 @@ static void test_emf_clipping(void)
     SetRect(&rc_sclip, 100, 100, GetSystemMetrics(SM_CXSCREEN), GetSystemMetrics(SM_CYSCREEN));
     hrgn = CreateRectRgn(rc_sclip.left, rc_sclip.top, rc_sclip.right, rc_sclip.bottom);
     SelectClipRgn(hdc, hrgn);
-    GetClipBox(hdc, &rc_res);
-    todo_wine ok(EqualRect(&rc_res, &rc_sclip),
+    ret = GetClipBox(hdc, &rc_res);
+todo_wine
+    ok(ret == SIMPLEREGION, "got %d\n", ret);
+    if(ret == SIMPLEREGION)
+        ok(EqualRect(&rc_res, &rc_sclip),
                  "expected rc_res (%d, %d) - (%d, %d), got (%d, %d) - (%d, %d)\n",
                  rc_sclip.left, rc_sclip.top, rc_sclip.right, rc_sclip.bottom,
                  rc_res.left, rc_res.top, rc_res.right, rc_res.bottom);