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sched: task_tick_rt: Remove the obsolete ->signal != NULL check
Remove the obsolete ->signal != NULL check in watchdog().
Since ea6d290c ->signal can't be NULL.
Signed-off-by: Oleg Nesterov <firstname.lastname@example.org>
Signed-off-by: Peter Zijlstra <email@example.com>
Signed-off-by: Ingo Molnar <firstname.lastname@example.org>