add comments

ssl/ssl.h

@@ -413,7 +413,7 @@ struct ssl_ctx_st
 
 	/* if defined, these override the X509_verify_cert() calls */
 /**/	int (*app_verify_callback)();
-/**/	char *app_verify_arg;
+/**/	char *app_verify_arg; /* never used */
 
 	/* default values to use in SSL structures */
 /**/	struct cert_st /* CERT */ *cert;

ssl/ssl_lib.c

@@ -1143,7 +1143,7 @@ void SSL_CTX_set_default_passwd_cb_userdata(SSL_CTX *ctx,void *u)
 void SSL_CTX_set_cert_verify_callback(SSL_CTX *ctx,int (*cb)(),char *arg)
 	{
 	ctx->app_verify_callback=cb;
-	ctx->app_verify_arg=arg;
+	ctx->app_verify_arg=arg; /* never used */
 	}
 
 void SSL_CTX_set_verify(SSL_CTX *ctx,int mode,int (*cb)(int, X509_STORE_CTX *))