audit: remove unnecessary #if CONFIG_AUDIT

The files which include kernel/audit.h are complied only when
CONFIG_AUDIT is set.

Just like audit_pid, there is no need to surround audit_ever_enabled
with CONFIG_AUDIT.
Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Eric Paris <eparis@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

kernel/audit.h

@@ -59,9 +59,7 @@ struct audit_entry {
 	struct audit_krule	rule;
 };
 
-#ifdef CONFIG_AUDIT
 extern int audit_ever_enabled;
-#endif
 
 extern int audit_pid;