rcu-tasks: Make rcu_tasks_postscan() be static

The rcu_tasks_postscan() function is not used outside of RCU's tasks.h
file, so this commit makes it be static.

Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
1 file changed