libsepol/cil: Properly reset an anonymous classperm set

In struct cil_classperms_set, the "set" field is a pointer to a
struct cil_classpermission. Normally the classpermission is created
in a classpermissionset rule with a name declared in a
classpermission rule and stored in a symbol table. Commit c49a8ea
("libsepol/cil: cil_reset_classperms_set() should not reset
classpermission") fixed the resetting of classperms sets by setting
the "set" field to NULL rather than resetting the classpermission
that it pointed to.

But this fix mixed the special case where an anonymous classperm
set is passed as an argument to a call. In this case the
classpermission is not named and not stored in a symtab, it is
created just for the classperms set and its classperms list needs
to be reset.

Reset the classperms list if the classperms set is anonymous (which
is when the datum name is NULL).

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

libsepol/cil/src/cil_reset_ast.c

@@ -60,10 +60,14 @@ static void cil_reset_classpermission(struct cil_classpermission *cp)
 
 static void cil_reset_classperms_set(struct cil_classperms_set *cp_set)
 {
-	if (cp_set == NULL) {
+	if (cp_set == NULL || cp_set->set == NULL) {
 		return;
 	}
 
+	if (cp_set->set->datum.name == NULL) {
+		cil_reset_classperms_list(cp_set->set->classperms);
+	}
+
 	cp_set->set = NULL;
 }