selinux: avoid unnecessary avc cache stat hit count

There is no point in counting hits - we can calculate it from the number
of lookups and misses.

This makes the avc statistics a bit smaller, and makes the code
generation better too.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

security/selinux/include/avc.h

@@ -41,7 +41,6 @@ struct sk_buff;
  */
 struct avc_cache_stats {
 	unsigned int lookups;
-	unsigned int hits;
 	unsigned int misses;
 	unsigned int allocations;
 	unsigned int reclaims;