libsepol/cil: cil_reset_classperms_set() should not reset classpermis…

…sion

In struct cil_classperms_set, the set field is a pointer to a
struct cil_classpermission which is looked up in the symbol table.
Since the cil_classperms_set does not create the cil_classpermission,
it should not reset it.

Set the set field to NULL instead of resetting the classpermission
that it points to.

Signed-off-by: James Carter <jwcart2@gmail.com>

libsepol/cil/src/cil_reset_ast.c

@@ -59,7 +59,11 @@ static void cil_reset_classpermission(struct cil_classpermission *cp)
 
 static void cil_reset_classperms_set(struct cil_classperms_set *cp_set)
 {
-	cil_reset_classpermission(cp_set->set);
+	if (cp_set == NULL) {
+		return;
+	}
+
+	cp_set->set = NULL;
 }
 
 static inline void cil_reset_classperms_list(struct cil_list *cp_list)