Fix egregious rbtree_x cache bug (taking the wrong modulus).
Fix egregious rbtree_x cache bug (taking the wrong modulus).

Also, add trace logic at LOCK trace level in rbtree_x.h in the
cacheing code only.

Signed-off-by: Matt Benjamin <1fa2ef4755a9226cb9a0a4840bd89b158ac71391@linuxbox.com>

sswen/ntirpc,sswen/ntirpc