[PATCH] smack: include linux/watch_queue.h

[kbuild test robot]

Hi Arnd,

I love your patch! Yet something to improve:

[auto build test ERROR on linus/master]
[cannot apply to v5.3-rc8 next-20190904]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Arnd-Bergmann/smack-include-linux-watch_queue-h/20190910-095704
config: ia64-allmodconfig (attached as .config)
compiler: ia64-linux-gcc (GCC) 7.4.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=7.4.0 make.cross ARCH=ia64 

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

All errors (new ones prefixed by >>):

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

vim +45 security/smack/smack_lsm.c

  > 45	#include <linux/watch_queue.h>
    46	#include "smack.h"
    47	

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