selinux: remove extraneous initialization of slots_used and max_chain_len

Variables slots_used and max_chain_len are being initialized to zero
twice. Remove the second set of initializations in the for loop.
Cleans up the clang warnings:

Value stored to 'slots_used' is never read
Value stored to 'max_chain_len' is never read
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NPaul Moore <paul@paul-moore.com>

security/selinux/ss/hashtab.c

@@ -150,7 +150,7 @@ void hashtab_stat(struct hashtab *h, struct hashtab_info *info)
 
 	slots_used = 0;
 	max_chain_len = 0;
-	for (slots_used = max_chain_len = i = 0; i < h->size; i++) {
+	for (i = 0; i < h->size; i++) {
 		cur = h->htable[i];
 		if (cur) {
 			slots_used++;