locking/rtmutex: Remove unused rt_mutex_cmpxchg_relaxed()
Signed-off-by:Alex Shi <alex.shi@linux.alibaba.com> Signed-off-by:
Thomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/1587135032-188866-1-git-send-email-alex.shi@linux.alibaba.com
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