sched, autogroup: Fix reference leak
The cgroup exit mess also uncovered a struct autogroup reference leak. copy_process() was simply freeing vs putting the signal_struct, stranding a reference. Signed-off-by: Mike Galbraith <efault@gmx.de> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Oleg Nesterov <oleg@redhat.com> LKML-Reference: <1293784350.6839.2.camel@marge.simson.net> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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