rcutorture: Abstract torture-test cleanup

This commit creates a torture_cleanup() that handles the generic
cleanup actions local to kernel/torture.c.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
diff --git a/include/linux/torture.h b/include/linux/torture.h
index 428d271..31d6993 100644
--- a/include/linux/torture.h
+++ b/include/linux/torture.h
@@ -65,7 +65,6 @@
 
 /* Definitions for online/offline exerciser. */
 int torture_onoff_init(long ooholdoff, long oointerval);
-void torture_onoff_cleanup(void);
 char *torture_onoff_stats(char *page);
 bool torture_onoff_failures(void);
 
@@ -80,14 +79,13 @@
 /* Task shuffler, which causes CPUs to occasionally go idle. */
 void torture_shuffle_task_register(struct task_struct *tp);
 int torture_shuffle_init(long shuffint);
-void torture_shuffle_cleanup(void);
 
 /* Shutdown task absorption, for when the tasks cannot safely be killed. */
 void torture_shutdown_absorb(const char *title);
 
 /* Initialization and cleanup. */
-
 void torture_init_begin(char *ttype, bool v);
 void torture_init_end(void);
+bool torture_cleanup(void);
 
 #endif /* __LINUX_TORTURE_H */