[PATCH] smack: fix an compile error in smack_post_notification

[kbuild test robot]

Hi zhong,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[cannot apply to v5.3 next-20190920]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/zhong-jiang/smack-fix-an-compile-error-in-smack_post_notification/20190923-112403
config: x86_64-allyesconfig (attached as .config)
compiler: gcc-7 (Debian 7.4.0-13) 7.4.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp at intel.com>

All errors (new ones prefixed by >>):

   In file included from security/smack/smack_lsm.c:45:0:
>> security/smack/smack.h:24:10: fatal error: linux/watch_queue.h: No such file or directory
    #include <linux/watch_queue.h>
             ^~~~~~~~~~~~~~~~~~~~~
   compilation terminated.

vim +24 security/smack/smack.h

    11	
    12	#include <linux/capability.h>
    13	#include <linux/spinlock.h>
    14	#include <linux/lsm_hooks.h>
    15	#include <linux/in.h>
    16	#if IS_ENABLED(CONFIG_IPV6)
    17	#include <linux/in6.h>
    18	#endif /* CONFIG_IPV6 */
    19	#include <net/netlabel.h>
    20	#include <linux/list.h>
    21	#include <linux/rculist.h>
    22	#include <linux/lsm_audit.h>
    23	#include <linux/msg.h>
  > 24	#include <linux/watch_queue.h>
    25	

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