selinux/ss/services.c should #include <linux/selinux.h>

Every file should include the headers containing the externs for its global
code.
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: James Morris <jmorris@namei.org>

security/selinux/ss/services.c

@@ -40,6 +40,7 @@
 #include <linux/sched.h>
 #include <linux/audit.h>
 #include <linux/mutex.h>
+#include <linux/selinux.h>
 #include <net/netlabel.h>
 
 #include "flask.h"