Avoid passing sudo_term_is_raw() -1 for the fd.

Coverity CID 330472
Coverity CID 330468

Author: millert

plugins/sudoers/sudoreplay.c

@@ -629,6 +629,9 @@ setup_terminal(struct eventlog *evlog, bool interactive, bool resize)
     /* Open fd for /dev/tty and set to raw mode. */
     if (interactive) {
 	ttyfd = open(_PATH_TTY, O_RDWR);
+	if (ttyfd == -1)
+	    sudo_fatal("%s", U_("unable to set tty to raw mode"));
+	if (ttyfd == -1)
 	while (!sudo_term_raw(ttyfd, SUDO_TERM_ISIG)) {
 	    if (errno != EINTR)
 		sudo_fatal("%s", U_("unable to set tty to raw mode"));

src/conversation.c

@@ -97,7 +97,8 @@ sudo_conversation(int num_msgs, const struct sudo_conv_message msgs[],
 		    if (ISSET(msg->msg_type, SUDO_CONV_PREFER_TTY) &&
 			    !ISSET(flags, TGP_STDIN)) {
 			ttyfd = open(_PATH_TTY, O_WRONLY);
-			raw_tty = sudo_term_is_raw(ttyfd);
+			if (ttyfd != -1)
+			    raw_tty = sudo_term_is_raw(ttyfd);
 		    } else {
 			raw_tty = sudo_term_is_raw(fileno(fp));
 		    }