cid#1558798 Unchecked return value

Change-Id: Iddb702f40ced018c104a8a42847bc396ba258ff8
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/160420
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolan.mcnamara@collabora.com>
diff --git a/vcl/source/outdev/font.cxx b/vcl/source/outdev/font.cxx
index 0e37c76..2086db7 100644
--- a/vcl/source/outdev/font.cxx
+++ b/vcl/source/outdev/font.cxx
@@ -1024,11 +1024,13 @@ bool OutputDevice::ForceFallbackFont(vcl::Font const& rFallbackFont)
{
    vcl::Font aOldFont = GetFont();
    SetFont(rFallbackFont);
    InitFont();
    if (!InitFont())
        return false;

    mpForcedFallbackInstance = mpFontInstance;
    SetFont(aOldFont);
    InitFont();
    if (!InitFont())
        return false;

    if (mpForcedFallbackInstance)
        return true;