[PATCH] smack: fix an compile error in smack_post_notification

[zhong jiang]

I hit the following error when compile the kernel.

security/smack/smack_lsm.c: In function smack_post_notification:
security/smack/smack_lsm.c:4383:7: error: dereferencing pointer to incomplete type struct watch_notification
  if (n->type == WATCH_TYPE_META)
       ^~
security/smack/smack_lsm.c:4383:17: error: WATCH_TYPE_META undeclared (first use in this function); did you mean TCA_PIE_BETA?
  if (n->type == WATCH_TYPE_META)
                 ^~~~~~~~~~~~~~~
                 TCA_PIE_BETA
security/smack/smack_lsm.c:4383:17: note: each undeclared identifier is reported only once for each function it appears in

Signed-off-by: zhong jiang <zhongjiang@xxxxxxxxxx>
---
 security/smack/smack.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/security/smack/smack.h b/security/smack/smack.h
index 62529f3..02b05a2 100644
--- a/security/smack/smack.h
+++ b/security/smack/smack.h
@@ -21,6 +21,7 @@
 #include <linux/rculist.h>
 #include <linux/lsm_audit.h>
 #include <linux/msg.h>
+#include <linux/watch_queue.h>
 
 /*
  * Use IPv6 port labeling if IPv6 is enabled and secmarks
-- 
1.7.12.4