quadtree: fix read-write lock mechanism (LOCK_READ -> RW_LOCK_READ, etc)
quadtree: fix read-write lock mechanism (LOCK_READ -> RW_LOCK_READ, etc)

Signed-off-by: Steven Noonan <4068f0880b399410602d694b3cc711c8a8f4727e@uplinklabs.net>

prophile/crisscross,prophile/crisscross,tycho/crisscross,tycho/crisscross,tycho/crisscross,prophile/crisscross