selinux: sparse fix: fix several warnings in the security server code

Fix several sparse warnings in the SELinux security server code.

Signed-off-by: James Morris <jmorris@namei.org>
diff --git a/security/selinux/ss/conditional.c b/security/selinux/ss/conditional.c
index a533732..2ec9041 100644
--- a/security/selinux/ss/conditional.c
+++ b/security/selinux/ss/conditional.c
@@ -555,7 +555,7 @@
 	return 0;
 }
 
-int cond_write_node(struct policydb *p, struct cond_node *node,
+static int cond_write_node(struct policydb *p, struct cond_node *node,
 		    struct policy_file *fp)
 {
 	struct cond_expr *cur_expr;