lib/rbtree: get successor's color directly
After move parent assignment out, we can check the color directly. Link: http://lkml.kernel.org/r/20191028021442.5450-2-richardw.yang@linux.intel.comSigned-off-by: Wei Yang <richardw.yang@linux.intel.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Michel Lespinasse <walken@google.com> Reviewed-by: Davidlohr Bueso <dbueso@suse.de> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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