8313252: Java_sun_awt_windows_ThemeReader_paintBackground release resources in early returns

Reviewed-by: clanger

src/java.desktop/windows/native/libawt/windows/ThemeReader.cpp

@@ -421,6 +421,7 @@ JNIEXPORT void JNICALL Java_sun_awt_windows_ThemeReader_paintBackground
             NULL, 0);
     if (hDibSection == NULL) {
         DTRACE_PRINTLN("Error creating DIB section");
+        DeleteDC(memDC);
         ReleaseDC(NULL,defaultDC);
         return;
     }