chardev: Restore CR,LF on stdio

Remove the 'stair-step output' on stdio.

This partially reverts commit 12fb0ac05, which was correct
on the mailing list but got corrupted by the maintainer :p

Introduced-by: 3b876140-c035-dd39-75d0-d54c48128fac@redhat.com
Reported-by: BALATON Zoltan <balaton@eik.bme.hu>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Tested-by: Laurent Desnogues <laurent.desnogues@gmail.com>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-id: 20180607210818.12727-1-f4bug@amsat.org
Suggested-by: Thomas Huth <thuth@redhat.com>
Tested-by: Laurent Desnogues <laurent.desnogues@gmail.com>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

chardev/char-stdio.c

@@ -59,7 +59,7 @@ static void qemu_chr_set_echo_stdio(Chardev *chr, bool echo)
     if (!echo) {
         tty.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP
                          | INLCR | IGNCR | ICRNL | IXON);
-        tty.c_oflag &= ~OPOST;
+        tty.c_oflag |= OPOST;
         tty.c_lflag &= ~(ECHO | ECHONL | ICANON | IEXTEN);
         tty.c_cflag &= ~(CSIZE | PARENB);
         tty.c_cflag |= CS8;