WaE: -Werror=maybe-uninitialized

Change-Id: I9311a1fbe7e22780bd086ffeb5ca24476f3121b8
diff --git a/vcl/opengl/x11/gdiimpl.cxx b/vcl/opengl/x11/gdiimpl.cxx
index 105cda3..f362605 100644
--- a/vcl/opengl/x11/gdiimpl.cxx
+++ b/vcl/opengl/x11/gdiimpl.cxx
@@ -725,7 +725,7 @@ bool X11OpenGLSalGraphicsImpl::RenderPixmap(X11Pixmap* pPixmap, X11Pixmap* pMask
    };

    Display* pDisplay = mrParent.GetXDisplay();
    bool bInverted;
    bool bInverted = false;

    const long nWidth = pPixmap->GetWidth();
    const long nHeight = pPixmap->GetHeight();