Use of uninitialised value of size 4

[Sebastien Bacher]

Running precise with unity SRU candidate from staging under valgrind I got those:

==4260== Use of uninitialised value of size 4
==4260== at 0x408AE8F: compiz::private_screen::History::setCurrentActiveWindowHistory(int, int) (screen.cpp:4242)
==4260== by 0x408B110: CompScreenImpl::moveViewport(int, int, bool) (screen.cpp:3816)
==4260== by 0x956C363: WallScreen::moveViewport(int, int, unsigned long) (in /usr/lib/compiz/libwall.so)

[Sebastien Bacher (seb128)]

that as well

==4260== Conditional jump or move depends on uninitialised value(s)
==4260== at 0x95715F9: WallScreen::positionUpdate(CompPoint const&) (in /usr/lib/compiz/libwall.so)
==4260== by 0x95727C8: boost::detail::function::void_function_obj_invoker1<boost::_bi::bind_t<void, boost::_mfi::mf1<void, WallScreen, CompPoint const&>, boost::_bi::list2<boost::_bi::value<WallScreen*>, boost::arg<1> > >, void, CompPoint const&>::invoke(boost::detail::function::function_buffer&, CompPoint const&) (in /usr/lib/compiz/libwall.so)
==4260== by 0x7FA3577: MousepollScreen::updatePosition() (in /usr/lib/compiz/libmousepoll.so)
==4260== by 0x7FA4150: boost::detail::function::function_obj_invoker0<boost::_bi::bind_t<bool, boost::_mfi::mf0<bool, MousepollScreen>, boost::_bi::list1<boost::_bi::value<MousepollScreen*> > >, bool>::invoke(boost::detail::function::function_buffer&) (in /usr/lib/compiz/libmousepoll.so)
==4260== by 0x40D2412: CompTimer::triggerCallback() (function_template.hpp:1013)
==4260== by 0x40D2520: CompTimeoutSource::callback() (timer.cpp:150)
==4260== by 0x40D2631: sigc::internal::slot_call0<sigc::bound_mem_functor0<bool, CompTimeoutSource>, bool>::call_it(sigc::internal::slot_rep*) (mem_fun.h:1787)
==4260== by 0x40D17AE: CompTimeoutSource::dispatch(sigc::slot_base*) (slot.h:440)
==4260== by 0x4586470: Glib::Source::dispatch_vfunc(_GSource*, int (*)(void*), void*) (main.cc:956)
==4260== by 0x45F8CD9: g_main_context_dispatch (gmain.c:2515)
==4260== by 0x45F90E4: g_main_context_iterate.isra.21 (gmain.c:3123)
==4260== by 0x45F952A: g_main_loop_run (gmain.c:3317)
==4260== by 0x42264D2: (below main) (libc-start.c:226)

(I've installed the debug symbols, will try to update those in a next run)