TTY: If parsing speed argument fails, do NOT default to B38400

If the speed argument to the `tty` stanza is invalid we should not
default to some other random speed.  Instead, leave the line speed
as-is, like we do when starting an external getty.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

src/exec.c

@@ -358,10 +358,8 @@ pid_t run_getty(char *tty, char *baud, char *term, int noclear, int nowait)
 
 		if (baud) {
 			speed = stty_parse_speed(baud);
-			if (B0 == speed) {
+			if (B0 == speed)
 				logit(LOG_CRIT, "TTY %s: Invalid speed %s", tty, baud);
-				speed = B38400;
-			}
 		}
 
 		prepare_tty(tty, speed, "finit-getty");