cifs: fix some unused variable warnings in id_rb_search

fs/cifs/cifsacl.c: In function ‘id_rb_search’:
fs/cifs/cifsacl.c:215:19: warning: variable ‘linkto’ set but not used
[-Wunused-but-set-variable]
fs/cifs/cifsacl.c:214:18: warning: variable ‘parent’ set but not used
[-Wunused-but-set-variable]
Reviewed-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

fs/cifs/cifsacl.c

@@ -211,19 +211,14 @@ id_rb_search(struct rb_root *root, struct cifs_sid *sidptr)
 {
 	int rc;
 	struct rb_node *node = root->rb_node;
-	struct rb_node *parent = NULL;
-	struct rb_node **linkto = &(root->rb_node);
 	struct cifs_sid_id *lsidid;
 
 	while (node) {
 		lsidid = rb_entry(node, struct cifs_sid_id, rbnode);
-		parent = node;
 		rc = compare_sids(sidptr, &((lsidid)->sid));
 		if (rc > 0) {
-			linkto = &(node->rb_left);
 			node = node->rb_left;
 		} else if (rc < 0) {
-			linkto = &(node->rb_right);
 			node = node->rb_right;
 		} else /* node found */
 			return lsidid;