[PATCH] Need forward decl of task_struct in linux/debug_locks.h

Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

include/linux/debug_locks.h

@@ -43,6 +43,8 @@ extern int debug_locks_off(void);
 # define locking_selftest()	do { } while (0)
 #endif
 
+struct task_struct;
+
 #ifdef CONFIG_LOCKDEP
 extern void debug_show_all_locks(void);
 extern void debug_show_held_locks(struct task_struct *task);