8.2.0rc0 Regression: '-display vnc' opens gtk display as well

Host environment

• Operating system: Operating system: Linux
• OS/kernel version: Linux rodrigo 6.1.0-13-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.55-1 (2023-09-29) x86_64 GNU/Linux
• Architecture: x86_64
• QEMU flavor: qemu-system-x86_64
• QEMU version: QEMU emulator version 8.1.50 - git bisect identifies 484629fc as the first bad commit
• QEMU command line:

  build/qemu-system-x86_64 -display vnc=:05 -k de

Emulated/Virtualized environment

• Operating system: n/a
• OS/kernel version: n/a
• Architecture: n/a

Description of problem

A VNC display is requested, but a GTK frontend is opened as well. A VNC client is able to connect.

Steps to reproduce

1. /configure --enable-fdt=internal --target-list=x86_64-softmmu
2. make
3. build/qemu-system-x86_64 -display vnc=:05 -k de

Additional information

git bisect finally shows

484629fc8141eaa257f961b5e5e310a1bbd0f1a2 is the first bad commit
commit 484629fc8141eaa257f961b5e5e310a1bbd0f1a2
Author: Marc-André Lureau <marcandre.lureau@redhat.com>
Date:   Wed Oct 25 17:21:17 2023 +0400

    vl: simplify display_remote logic
    
    Bump the display_remote variable when the -vnc option is parsed, just
    like -spice.
    
    Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
    Reviewed-by: Thomas Huth <thuth@redhat.com>

 system/vl.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)