silence DrMemory warning about Selected font handle deleted

This might actually matter in practice given

https://stackoverflow.com/questions/27422871/does-deletedc-automatically-unselect-objects

"DCs get a default 1x1x1 bitmap when they're created. This will leak if you don't put it back."

Change-Id: Ib2d361995621ad429277ff52cb8c9fdfc0009953
Reviewed-on: https://gerrit.libreoffice.org/38875Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

vcl/source/gdi/CommonSalLayout.cxx

@@ -53,13 +53,14 @@ static hb_blob_t* getFontTable(hb_face_t* /*face*/, hb_tag_t nTableTag, void* pU
     unsigned char* pBuffer = nullptr;
     HFONT hFont = static_cast<HFONT>(pUserData);
     HDC hDC = GetDC(nullptr);
-    SelectObject(hDC, hFont);
+    HGDIOBJ hOrigFont = SelectObject(hDC, hFont);
     nLength = ::GetFontData(hDC, OSL_NETDWORD(nTableTag), 0, nullptr, 0);
     if (nLength > 0 && nLength != GDI_ERROR)
     {
         pBuffer = new unsigned char[nLength];
         ::GetFontData(hDC, OSL_NETDWORD(nTableTag), 0, pBuffer, nLength);
     }
+    SelectObject(hDC, hOrigFont);
     ReleaseDC(nullptr, hDC);
 #elif defined(MACOSX) || defined(IOS)
     unsigned char* pBuffer = nullptr;