audit: use current whenever possible

There are many places, notably audit_log_task_info() and
audit_log_exit(), that take task_struct pointers but in reality they
are always working on the current task.  This patch eliminates the
task_struct arguments and uses current directly which allows a number
of cleanups as well.

Acked-by: Richard Guy Briggs <rgb@redhat.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
diff --git a/include/linux/audit.h b/include/linux/audit.h
index 58cf665..a625c29 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -151,8 +151,7 @@
 extern void		    audit_log_lost(const char *message);
 
 extern int audit_log_task_context(struct audit_buffer *ab);
-extern void audit_log_task_info(struct audit_buffer *ab,
-				struct task_struct *tsk);
+extern void audit_log_task_info(struct audit_buffer *ab);
 
 extern int		    audit_update_lsm_rules(void);
 
@@ -200,8 +199,7 @@
 {
 	return 0;
 }
-static inline void audit_log_task_info(struct audit_buffer *ab,
-				       struct task_struct *tsk)
+static inline void audit_log_task_info(struct audit_buffer *ab)
 { }
 #define audit_enabled AUDIT_OFF
 #endif /* CONFIG_AUDIT */