watchdog/core: Put softlockup_threads_initialized under ifdef guard
The variable is unused when the softlockup detector is disabled in Kconfig.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
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The variable is unused when the softlockup detector is disabled in Kconfig.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>