SELinux: kills warnings in Improve SELinux performance when AVC misses

This patch kills ugly warnings when the "Improve SELinux performance
when ACV misses" patch.

Signed-off-by: KaiGai Kohei <kaigai@ak.jp.nec.com>
Signed-off-by: James Morris <jmorris@namei.org>
diff --git a/security/selinux/ss/ebitmap.h b/security/selinux/ss/ebitmap.h
index e38a327..f283b43 100644
--- a/security/selinux/ss/ebitmap.h
+++ b/security/selinux/ss/ebitmap.h
@@ -21,6 +21,8 @@
 #define EBITMAP_UNIT_SIZE	BITS_PER_LONG
 #define EBITMAP_SIZE		(EBITMAP_UNIT_NUMS * EBITMAP_UNIT_SIZE)
 #define EBITMAP_BIT		1ULL
+#define EBITMAP_SHIFT_UNIT_SIZE(x)					\
+	(((x) >> EBITMAP_UNIT_SIZE / 2) >> EBITMAP_UNIT_SIZE / 2)
 
 struct ebitmap_node {
 	struct ebitmap_node *next;