Rename log_warning flags and only send mail if SLOG_SEND_MAIL is

set instead of mailing by default like we used to.

plugins/sudoers/auth/sia.c

@@ -104,8 +104,7 @@ sudo_sia_setup(struct passwd *pw, char **promptp, sudo_auth *auth)
 
     if (sia_ses_init(&siah, sudo_argc, sudo_argv, NULL, pw->pw_name, user_ttypath, 1, NULL) != SIASUCCESS) {
 
-	log_warning(NO_MAIL,
-	    N_("unable to initialize SIA session"));
+	log_warning(0, N_("unable to initialize SIA session"));
 	debug_return_int(AUTH_FATAL);
     }